JP2000021285A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fix an electromagnetic coil, simply conduct adjustment after coiling, and easily provide stable tripping characteristics. SOLUTION: Holding grooves 2b for holding a flexible conductor 1 are formed in flanges 2a at both ends of a bobbin 2, and when the flexible conductor 1 is coiled around the bobbin 2 to form an electromagnetic coil 8, the coiling start and the coiling end of the flexible conductor 1 are held and fixed to the holding grooves 2b. An insertion opening of the holding groove 2b is formed slightly smaller than the diameter of the flexible conductor 1, and a holding part on the inside is formed in the width equivalent to two flexible conductors 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having an electromagnetic trip device, and more particularly to an improvement in a method of fixing an electromagnetic coil provided in an electromagnetic trip device.

[0002]

2. Description of the Related Art A circuit breaker having a plunger mechanism in an electromagnetic trip device is usually configured as shown in FIG. The plunger mechanism winds the flexible conductor 1 around the bobbin 2 to form an electromagnetic coil 8 and passes the plunger 3 through the center of the bobbin 2. A magnetic path is formed by the plunger 3, the yoke 4, and the movable iron piece 5. When a short circuit occurs, a short-circuit current flows through the flexible conductor 1, and the plunger 3 attracts the movable iron piece 5 by the magnetic force generated by the electromagnetic coil 8. And
The trip operation is performed by the action, and the circuit is cut off. In the electromagnetic coil formed of the flexible conductor in this manner, the winding start and the winding end of the flexible conductor are collectively tied and fixed together by the binding band 10 so that the winding shape or the tripping characteristic does not change. .

[0003]

However, in the fixing method using the binding band 10, it is difficult to make the binding state of the flexible conductor 1 uniform, and the winding strength of the electromagnetic coil 8 varies, and the shape and the coil radius vary. As a result, the tripping characteristics were unstable, and when the binding position by the binding band 10 was shifted, the length of the flexible conductor before and after the coil forming portion changed, and assembly was not possible. In addition, when making the adjustment, the binding band 10 had to be cut and newly bound.

Accordingly, an object of the present invention is to make it possible to easily perform adjustment after fixing and winding of an electromagnetic coil, and to easily obtain stable tripping characteristics.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a bobbin formed by winding an insulated flexible conductor to form an electromagnetic coil, a plunger inserted through the bobbin, and the electromagnetic coil. In a circuit breaker provided with an electromagnetic trip device having a yoke forming a magnetic path and a movable iron piece, a component is provided in a component of the electromagnetic trip device to fix the electromagnetic coil.

According to a second aspect of the present invention, in the first aspect, the fixing portion is a holding groove formed in a flange portion of the bobbin.
A pair of a winding start and a winding end of a flexible conductor forming an electromagnetic coil is held and fixed in the holding groove.

According to a third aspect of the present invention, in the first aspect of the present invention, the fixing portion is a holding groove formed in the yoke, and the winding start and end of the flexible conductor forming the electromagnetic coil are formed in the holding groove. It is configured by holding and fixing a pair.

According to a fourth aspect of the present invention, in the second or third aspect, the holding groove has an insertion opening slightly narrower than the diameter of the flexible conductor, and the inside thereof can hold two flexible conductors. It is configured to have a width.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the fixing portion is a cover connected to the bobbin. It has a notch, the winding start and the winding end of the flexible conductor forming the electromagnetic coil enter and exit through the notch, and the flexible conductor is locked and fixed to the notch end face.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of the inside of a circuit breaker showing a first embodiment of a circuit breaker according to the present invention, and FIG. 2 is a front view of the bobbin shown in FIG. The same components as those in FIG. 7 are denoted by the same reference numerals.

FIG. 1 shows only one pole of a circuit breaker having a two-pole, four-terminal structure. The electromagnetic trip device includes a plunger mechanism for detecting a short-circuit current and an engagement piece 7 for performing a breaking operation by operating the plunger mechanism. The plunger mechanism comprises an electromagnetic coil 8 formed by winding a flexible conductor 1 connecting a load-side terminal (not shown) and a movable contact 12 on the power supply side around the bobbin 2, and a center of the bobbin 2. With the plunger 3 inserted,
The yoke 4 includes a yoke 4 forming a magnetic path together with the plunger 3, and a movable iron piece 5 having one end pivotally attached to the yoke 4. The flexible conductor 1 is covered with an insulating tube or the like and is insulated. The movable iron piece 5 is constantly urged leftward in the figure by a spring 6, and when the load is short-circuited, the movable iron piece 5 is attracted to the plunger 3 by the electromagnetic action of the plunger 3.
The movable piece 12 is disengaged by operating the engagement piece 7 to perform a breaking operation.

The electromagnetic coil 8 is formed by winding the flexible conductor 1 extending from the load-side terminals of both poles one by one adjacent to one bobbin 2 so that the winding start and the winding end are both performed. The bobbin 2 is fixed by being inserted into a holding groove 2b formed in a flange portion 2a.

FIG. 2 is a front view of the bobbin as viewed from A. A holding groove 2b is formed between two claw-like projections extending downward on a flange 2a of the bobbin 2. Slightly smaller than the diameter, the inner holding portion is formed to have a width of two flexible conductors. Further, the flange portion 2a is provided at the front end and the rear end of the bobbin 2, and the holding grooves 2b are formed at both the ends thereof. It can be fixed. still,
Reference numeral 2c denotes a locking projection of the spring 6.

The winding and fixing operation of the flexible conductor 1 around the bobbin 2 may be performed by winding the flexible conductor 1 around the bobbin 2 once and then inserting the winding start and the winding end into one of the holding grooves. By doing so, the entrance of the holding groove 2b is smaller than the diameter of the flexible conductor, so that it does not come out, and the internal holding portion has the width of exactly two flexible conductors. It can be fixed without. If the flexible conductors at the beginning and the end of the winding are opened after the insertion, this fixing action is further strengthened. Then, the other flexible conductor 1 may be similarly inserted and fixed in the other holding groove 2b.

As described above, since the locking and fixing are performed only by inserting the two positions of the winding start and the winding end into the holding groove, the fixing operation of the electromagnetic coil is easy and the winding condition is adjusted. Can be performed by once removing the flexible conductor from the holding groove, so there is no site to be cut when adjusting.
Since no new binding tool or fixing tool is required, the adjustment can be made easily. Further, since the two windings are provided side by side in the holding groove, the winding start and the winding end can be conveniently fixed symmetrically, and a stable tripping characteristic can be obtained. Furthermore,
Since there is no interference with the fixed portion of the other flexible conductor at the time of adjustment, it is possible to adjust independently even if there are a plurality of coils, so that the adjustment operation does not require extra labor and a tying tool such as a tying band. Since it is not necessary, it can be made inexpensive.

FIG. 3 shows a second embodiment. In this case, the flexible conductor 1 and the plunger 3 together with the electromagnetic coil 8
Are fixed to the yoke 4 for forming a magnetic path. FIG. 4 is a front view of the yoke 4 viewed from the direction B in FIG.
Nipping grooves 4 similar to the nipping grooves formed on the bobbin
b, 4c are formed. 4d is a plunger insertion hole. The winding and fixing operation of the flexible conductor 1 may be performed in the same manner as in the above embodiment, and the winding start and the winding end may be inserted and clamped in the same clamping groove.

FIG. 5 shows a third embodiment, and FIG. 6 is a three-view drawing of the bobbin 20 of FIG. As shown in the figure, the bobbin 20 is attached to a cylindrical cover 20 from around the front flange 20a.
c is formed, and the bobbin 20
A notch 20e is provided in parallel with the center axis of the bobbin, and the rear end of the bobbin is open. The notch 20e is an outlet of the flexible conductor 1 and has a width twice as large as the diameter of the flexible conductor 1. The notch 20e is inserted into the hollow cylindrical portion 20d so as to go around the flexible conductor 1 and is provided with an electromagnetic coil. Are formed with notches 20e
, The winding start and the winding end of the flexible conductor 1 are locked and fixed to the end of the notch 20e.

As described above, the flexible conductor may be fixed by providing the holding groove in the yoke, or the cover having the cutout for drawing out the flexible conductor may be provided on the bobbin without providing the locking groove. You may make it lock and fix to a notch. In any case, as in the first embodiment, since the winding start and the winding end are fixed, the coil portion can obtain a stable tripping characteristic without being deformed, and the winding can be easily adjusted. It can be carried out. Also, it is not necessary to use a binding band. In the above-described embodiment, the holding grooves provided on the bobbin are provided one by one on the front and rear flanges. However, two holding grooves may be provided on any one of the flanges. May be provided one by one.

[0019]

As described in detail above, according to the first aspect of the present invention, since the electromagnetic coil is fixed by the constituent members of the electromagnetic trip device, a binding fixture such as a binding band is not used. Inexpensive configuration can be achieved.

According to the second and third aspects of the present invention, the winding start and the winding end of the flexible conductor are held and fixed in the holding grooves formed in the flange portion and the yoke of the bobbin. Even if the winding position is shifted, it can be easily adjusted by removing the flexible conductor from the holding groove. In addition, even if there are a plurality of electromagnetic coils, they can be independently adjusted by being held in independent holding grooves.

According to the fourth aspect of the present invention, since the insertion opening of the holding groove is smaller than the diameter of the flexible conductor, the inserted flexible conductor does not come off, and two of the flexible conductors can be held side by side. The winding start and end of the wound flexible conductor can be conveniently clamped and fixed, and a stable tripping characteristic can be obtained.

According to the fifth aspect of the present invention, since the cutout portion of the cover serves as the entrance and exit of the flexible conductor, the cover can be simultaneously fixed by forming the electromagnetic coil. It can be done easily.

[Brief description of the drawings]

1A and 1B show an example of an embodiment of the present invention, in which FIG. 1A is a plan view inside a circuit breaker, and FIG.

FIG. 2 is a front view of the bobbin shown in FIG.

3A and 3B show a second embodiment of the present invention, wherein FIG. 3A is a plan view of the inside of a circuit breaker, and FIG.

FIG. 4 is a front view of the yoke shown in FIG.

FIGS. 5A and 5B show a third embodiment of the present invention, wherein FIG. 5A is a plan view showing the inside of a circuit breaker, and FIG.

6A is a front view of the bobbin shown in FIG. 5, and FIG.
(B) is a sectional view, and (c) is a rear view.

7A and 7B show a conventional circuit breaker, wherein FIG. 7A is an internal plan view and FIG. 7B is an explanatory longitudinal sectional view.

[Explanation of symbols]

1. Flexible conductor, 2 Bobbin, 2a Flange, 2b
· Nipping groove, 2c · · · locking projection, 3 · · · plunger, 4 ·
・ Yoke, 4b, 4c ・ ・ Nipping groove, 5 ・ ・ Movable iron piece, 6
..Spring, 7 ... engaging piece, 8 ... electromagnetic coil, 10 ...
Cable ties, 12 movable contacts, 20 bobbins, 2
0a ... Tsubasa, 20c ... Cover, 20d ... Tube, 2
0e ... Notch.

Claims (5)

[Claims] 1. An electromagnetic trip device comprising a bobbin having an electromagnetic coil formed by winding an insulated flexible conductor, a plunger inserted through the bobbin, a yoke forming a magnetic path by the electromagnetic coil, and a movable iron piece. A circuit breaker in which a fixing portion is provided on a component of the electromagnetic trip device to fix the electromagnetic coil. 2. The fixing portion is a holding groove formed in a flange portion of a bobbin, and a pair of a winding start and a winding end of a flexible conductor forming an electromagnetic coil is held and fixed in the holding groove.
The described circuit breaker. 3. The circuit breaker according to claim 1, wherein the fixing portion is a holding groove formed in the yoke, and a pair of a winding start and a winding end of the flexible conductor forming the electromagnetic coil is held and fixed in the holding groove. vessel. 4. The circuit breaker according to claim 2, wherein the insertion opening of the holding groove is slightly smaller than the diameter of the flexible conductor, and the inside has a width capable of holding two flexible conductors. 5. A cover having a fixed portion connected to the bobbin, wherein the cover is formed so as to cover the periphery of the electromagnetic coil, has a cutout parallel to the axis of the bobbin, and is flexible to form the electromagnetic coil. 2. The circuit breaker according to claim 1, wherein the start and end of winding of the conductor are inserted and removed through the notch, and the flexible conductor is locked and fixed to the notch end face.