JP2010287620A - Electromagnetic coil device and method of processing coil terminal thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic coil device such that even coil winding formed of a thin strand includes a highly reliable reinforced winding terminal portion and a reinforcing operation is easily performed even for coil winding formed of a strand having a little larger wire diameter, and a method of processing a coil terminal thereof. <P>SOLUTION: Lock pieces for locking terminals of coil winding are provided at an outer periphery of a flange of a coil bobbin wound with the coil winding, strands of winding beginning and winding ending terminal portions of the coil winding, wound around the coil bobbin, which extend outward from the flange have base end sides locked to the lock pieces, and folded back a plurality of times to form folded-back strand bundles of predetermined length, and the strand bundles are twisted a suitable number of times to form lead-out terminals bundled and fixed to the lock pieces of the flange of the coil bobbin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic coil device used for an overcurrent electromagnetic tripping device or the like of a circuit breaker and a method for processing the coil winding terminal.

  As shown in Patent Document 1, the circuit breaker incorporates an electromagnetic trip device that detects a circuit current and, when this becomes an overcurrent, pulls the latch of the switching mechanism to cut off the circuit current. .

  In order to simplify the assembly work when assembling a circuit breaker by incorporating such an electromagnetic trip device into a resin mold case of a circuit breaker, an electromagnetic trip device is provided inside the resin mold case divided into two parts. Positioning seats corresponding to each component such as yokes, iron cores, and electromagnetic coils are formed, and each part is individually fixed to the positioning seat in the process of assembling the circuit breaker. I am trying to incorporate it.

  FIG. 4 shows the overall configuration of a circuit breaker incorporating an electromagnetic trip device. In FIG. 4, 1 is a resin mold case having a two-part structure, 2 and 3 are main circuit terminals drawn from the bottom wall of the resin mold case 1, 4 is a stationary contact, 5 is a movable contact, and 6 is an opening / closing mechanism. , 6a is a latch for locking the open / close spring 6b of the open / close mechanism in a stored state, 7 is an opening / closing operation handle, 10 is an electromagnetic trip device, and the electromagnetic trip device 10 includes the main circuit terminal 3 and the movable armature 5 It is connected between and.

  The electromagnetic trip device 10 includes an L-shaped yoke 11, a plunger built-in iron core 12 that is combined by being inserted into a hole drilled in a leg portion of the yoke 11, and an electromagnetic coil 13 disposed on the outer periphery of the iron core 12. The armature 14 is pivotally supported on the upper end of the yoke 11 and is opposed to the armature 12a of the iron core 12. As will be described later, the legs of the yoke 11 and the upper end of the iron core 12 are respectively connected to the interior of the mold case 1. The electromagnetic trip device 10 is fixed at a predetermined position by being locked and fixed to a positioning seat (not shown) formed in the above. In this fixed position, the operation piece 14a of the armature 14 is connected to the latch 6a of the opening / closing mechanism 6. The operation of the electromagnetic trip device 10 is described in detail in Patent Document 2, and the description thereof is omitted here.

  As shown in FIG. 5, the electromagnetic coil 13 is wound around a coil bobbin 13a with a winding 13b covered with an insulating sheet 13c, and the winding 13b is wound at the beginning and at the end of winding. Terminals 13b-1 and 13b-2 are formed and drawn downward through notches 13a-5 and 13a-6 (see FIG. 6) provided in the flange 13a-2 of the bobbin 13a. As shown in FIG. 6, the bobbin 13a is integrally formed with a lower collar 13a-2 and an upper collar 13a-3 at both ends of a cylindrical winding frame 13a-1, and a cylindrical projection 13a-4 at the upper end side. It is comprised from the resin-molded product.

  By the way, as for the coil winding of the electromagnetic coil of such an electromagnetic trip device, the thickness of the strand is selected by the current capacity of the circuit breaker, and when the current capacity is small, the thickness of the strand becomes thin.

  The extraction terminal formed by processing the winding end of the electromagnetic coil of the electromagnetic trip device is fixed by soldering to the connection terminal in the circuit breaker, so it is in use when the wire of the electromagnetic coil is thin In some cases, the lead terminal may be disconnected due to vibrations continuously received, resulting in poor conduction.

  In order to improve this and strengthen the strength of the winding terminal portion, the following measures are taken.

  As one countermeasure, as shown in FIG. 7A, the wire of the coil winding terminal portion 13b-1 is wound around one end of a lead wire 13d-1 formed of a conductor having a larger diameter than the coil wire. As shown in FIG. 7B, the winding portion of the lead wire is placed on the coil 13b, and the outer periphery thereof is covered with the insulating sheet 13c to be fixed together with the coil winding 13b. The reinforced lead terminals 13d-1 and 13d-2 are formed. This is called a leader line system.

  As shown in FIG. 8 (a), another measure is to fold the wire 13a-2 of the coil 13b a predetermined number of times by hooking it on the hook-shaped twisting jig 18 in a state where it is hooked. Is formed, and the wire bundle 13e-2 ′ is twisted a predetermined number of times as indicated by an arrow B by twisting the wire bundle 13e-2 ′. In addition, the stranded wire-like lead terminals 13e-1 and 13e-2 are formed, and the insulating sheet is placed with the base end portion placed on the coil winding 13b as shown in FIG. 8B. It is fixed together with the coil winding 13b by covering with 13c to form reinforced lead terminals 13e-1 and 13e-2. This is called a stranded wire system.

JP 2006-302634 A Japanese Patent No. 3475598

  The lead wire method for reinforcing the winding terminal of the electromagnetic coil is a separate process for forming the coil winding and the terminal processing step for reinforcing the winding terminal, so the terminal processing status can be confirmed. There is an advantage that the reliability of the reinforcement work can be improved, but when the wire diameter of the winding wire becomes thick to some extent, not only the work of winding the end of the coil winding around the lead wire becomes difficult, but also the stranded wire method There is a problem that the manufacturing cost is higher than the above measures.

  In addition, the stranded wire type reinforcement measures have advantages that the manufacturing cost is lower than that of the lead wire type reinforcement measures, and that the work of adding a twist to the strands having a larger wire diameter than the lead wire method is easy. Since the coil winding work must be performed continuously from the end of the winding end to the end of the winding end treatment, the base end of the lead terminal formed by twisting is hidden by the insulating sheet and correctly twisted. It is difficult to confirm whether or not it is done, and there is a problem that the wire breakage that occurs during the twisting process is overlooked and the reliability of the reinforcement work is lowered.

  In order to eliminate the problems in the conventional measures for reinforcing the winding terminal portion as described above, the present invention provides a reliable reinforced lead terminal even for a coil winding formed of a thin wire. Provided is an electromagnetic coil device that can be obtained and that can easily perform terminal processing for reinforcement even for a coil winding formed of a somewhat thick wire, and a method for processing the winding terminal Is an issue.

  In order to solve the above-described problem, the present invention provides an electromagnetic coil device in which a coil wire is wound a predetermined number of times around a coil bobbin made of an insulating material provided with hooks on both upper and lower ends of a cylindrical winding frame. A locking piece for locking the winding terminal portions at both ends of the coil is provided on the outer periphery of at least one of the coils, and the windings of the winding winding start and end terminals of the coil winding wound around the coil bobbin are provided. A base end is formed by twisting the strand bundle by twisting the strand bundle as many times as necessary to form a strand bundle by causing the base end side to be engaged with the locking piece and bent back multiple times to a predetermined length. A portion is formed with a lead terminal fixedly bound to a hook locking piece of the coil bobbin.

  In the coil terminal processing method according to the present invention, a twisting jig having a hook-shaped tip that can be driven to rotate is provided, and the jig is provided on a hook of a bobbin around which the coil winding is wound. After being separated from each other by a predetermined distance and facing each other, the wire extending to the outside of the flange of the end portion of the coil winding is locked between the flange portion of the jig and the locking piece of the flange. A wire bundle of a predetermined length is formed by winding a plurality of turns, and twisting is applied to the wire bundle by rotationally driving the jig, and the base end portion of the wire bundle is engaged with the hook of the coil bobbin. The lead terminal is formed by twisting together a plurality of strands by binding and fixing to a piece and then removing the jig from the strand bundle.

  According to the present invention, the base end portions of the winding start and winding end terminals drawn to the outside from the bobbin flange of the coil winding wound around the coil bobbin are locked to the locking pieces provided on the coil bobbin flange. Since the twisting of the folded wire bundle formed by bending multiple times is performed outside the bobbin, the finish of the twisting process can be visually confirmed, and the reliability of reinforcement by twisting of the coil end portion is improved. be able to.

  Since the extraction terminal formed by the reinforced coil terminal is supported by binding the base end portion to the locking piece provided on the flange of the bobbin, the external force applied to the extraction terminal is received by the locking piece, It is no longer transmitted to the wire of the winding wound in the bobbin, and disconnection due to the external force of the coil winding can be suppressed.

1 is a partially cutaway configuration diagram showing an electromagnetic coil device according to an embodiment of the present invention. It is a figure which shows the process process of the terminal of the coil winding for reinforcing the terminal of the coil winding by the Example of this invention. It is a perspective view which shows the structure of the coil bobbin used for this invention. It is sectional drawing which shows a field structure of the circuit breaker in which the conventional electromagnetic trip apparatus was incorporated. It is a partial cross-section block diagram which shows the conventional electromagnetic coil apparatus. It is a perspective view which shows the structure of the coil bobbin of the conventional electromagnetic coil apparatus. It is a figure which shows the processing method of the coil winding terminal of the conventional electromagnetic coil apparatus. It is a figure which shows the processing method of the coil winding terminal of another conventional electromagnetic coil apparatus.

  Embodiments of the present invention will now be described with reference to the drawings.

  1 to 3 show the present invention. FIG. 1 is a partially cutaway configuration diagram showing an electromagnetic coil device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a process of processing a coil winding end for reinforcing the coil winding end according to an embodiment of the present invention. FIG. 3 is a perspective view showing the configuration of the coil bobbin used in the present invention.

  1 to 3, the same parts as those of the conventional apparatus are denoted by the same reference numerals. In these drawings, the electromagnetic coil device 13 includes a coil bobbin 13a formed of an insulating resin mold, and a coil winding 13b formed by winding a winding wire around the bobbin by a desired number of turns. The outer periphery of the wire 13b is covered and protected by an insulating sheet 13c. The wire bundle bundled by bending the winding start terminal portion 13b-1 and the winding end terminal portion 13b-2 of the coil winding 13b a plurality of times to a predetermined length is pulled out below the lower rod 13a-2 of the bobbin. The wire bundle (13b-3 ′, 13b-4 ′) folded and bundled at the terminal portion has locking pieces 13a-7 and 13a-8 (the base end portion of which is provided on the lower collar 13a-2 of the bobbin). Reinforced lead terminals 13b-3 and 13b-4 are formed by locking and twisting and integrating with each other (see FIG. 3).

  The lead terminals 13b-3 and 13b-4 are formed by twisting a plurality of strands in this way, and the base ends of the locking pieces 13a-7 and 13a-8 provided on the lower arm of the coil bobbin 13a, respectively. Since the whole is pulled out to the outside of the insulating sheet 13c, the finish of the twisting process can be visually confirmed, and the reliability of the finish can be improved. Moreover, even if it is comprised by a thin strand, rigidity is increased and a mechanical strength becomes strong and can fully function as an extraction | extension terminal by twisting together several strands and comprising it integrally.

  Further, when the electromagnetic trip device incorporating the electromagnetic coil device 13 is used by being incorporated in a circuit breaker as shown in FIG. 4, the lead terminals 13b-3 and 13b-4 of the electromagnetic coil device are connected to the coil bobbin 13a. Since it is bound and supported by the locking pieces 13a-7 and 13a-8 provided on the lower arm of the lower arm, even if an external force such as vibration is applied to the lead terminal during use, the external force is a thin element constituting the coil winding. Since it is not transmitted to the wire, it is possible to prevent the coil winding from being disconnected.

  Next, an example of a terminal processing method for forming the lead terminals 13b-3 and 13b-4 of the electromagnetic coil device will be described with reference to FIG.

  In FIG. 2, reference numeral 18 denotes a hook-shaped twisting jig used for terminal processing, which may be supported by an electric rotary drive mechanism or the like (not shown).

  This jig 18 is disposed opposite to one locking piece 13a-7 provided on the flange 13a-2 of the coil bobbin 13a while being separated by a predetermined distance. The end of the winding start portion 13b-1 of the coil winding 13b drawn downward from the flange 13a-2 is folded back in the direction of arrow A while being hooked on the flange of the jig 18, and the bobbin locking piece 13a-7 is further folded. The winding operation for returning to the original position by repeating is repeated a predetermined number of times. As a result, as shown in FIG. 2 (b), the base end side is locked to the locking piece 13a-7 of the bobbin, and a wire bundle 13b-3 'is formed by being wound a plurality of times and bundled.

  By performing the same processing on the winding end terminal portion 13b-2 of the coil winding 13b, the wire bundle 13b-4 'locked to the locking piece 13a-8 of the bobbin is formed.

  When the strand bundles 13b-3 ′ and 13b-4 ′ are formed in this way, the jig 18 inserted at the tip of the strand of the strand bundle 13b-3 ′ is manually or electrically operated as shown in FIG. As indicated by an arrow B by a rotary driving machine, the wire bundle is twisted by a predetermined number of rotations in a certain direction. When the twisting process is completed, by removing the jig 18 from the strand 13b-3 ', a plurality of strands as shown in FIG. 1 are twisted together, and the base end portion is a locking piece 13a- of the coil bobbin. 7 is formed as a lead terminal 13b-3 which is bound and fixed to 7.

  The other strand bundle 13b-4 'is also subjected to the same twisting process by placing the jig 18, thereby forming the lead terminal 13b-4 bound and fixed to the locking piece 13a-8 of the coil bobbin 13a.

13: Electromagnetic coil device 13a: Coil bobbins 13a-7, 13a-8: Locking piece 13b: Coil winding 13b-3, 13b-4: Lead-out terminal 13c: Insulating sheet

Claims (2)

  In an electromagnetic coil device configured by winding a coil wire around a coil bobbin made of an insulating material provided with hooks on both upper and lower ends of a cylindrical winding frame a predetermined number of times, the outer ends of at least one of the hooks of the coil bobbin A locking piece for locking the winding terminal portion is provided, and the wire extending outward from the flange of the winding winding start end and winding end of the coil winding wound around the coil bobbin is arranged on the base end side. A plurality of wire bundles are formed by being bent back to a predetermined length by being engaged with the engagement pieces, and the strands of the wire bundles are twisted and twisted as appropriate to bind the proximal end portion to the engagement pieces of the coil bobbin collar. An electromagnetic coil device characterized by forming a fixed lead terminal.   A twisting jig with a tip that can be rotated and driven is provided in a hook shape, and this jig is opposed to a locking piece provided on a hook of a bobbin around which the coil winding is wound. Then, the wire extending to the outside of the flange of the end portion of the coil winding is locked between the flange portion of the jig and the locking piece of the flange and wound a plurality of times to a predetermined length. Then, the wire bundle is twisted by rotationally driving the jig, and the base end portion of the wire bundle is bound and fixed to the hook locking piece of the coil bobbin. A method of processing a winding terminal of an electromagnetic coil device, wherein a lead terminal is formed by twisting a plurality of strands by removing the tool from the strand of wires.

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