JP2016219374A - Electromagnetic overcurrent trip device of circuit breaker and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic overcurrent trip device of circuit breaker of such a type as not having a bobbin for winding a coil, in which a leakage iron piece for magnetic flux by-pass can be fixed to a predetermined position, and a manufacturing method therefor.SOLUTION: An electromagnetic overcurrent trip device 10 of circuit breaker includes an L-shaped yoke 11 attached to a unit case 2, an oil dash pot 12 penetrating the upper leg piece 11a of the L-shaped yoke 11 perpendicularly, and having an armature 13 attached to the lower end, a coil 14 wound directly around the oil dash pot 12, a movable iron piece 15 supported swingably at the lower end of the lower side leg piece 11b of the L-shaped yoke 11, a leakage iron piece 16 for magnetic flux by-pass by-passing a part of the magnetic flux flowing through the magnetic circuit, and a holder 17 for holding the leakage iron piece 16 for magnetic flux by-pass at a predetermined position, and interposed between the coil 14 and armature 13.SELECTED DRAWING: Figure 16

Description

  The present invention relates to an electromagnetic overcurrent tripping device for a circuit breaker and a method for manufacturing the same.

Generally, in an electromagnetic overcurrent tripping device for a circuit breaker, when the current flowing through the coil becomes excessive, the circuit breaker is tripped to interrupt the electric circuit. In such an electromagnetic overcurrent tripping device, a delay operation characteristic is provided so that the circuit breaker does not trip due to an excessive current flowing in a short time such as when the motor is started.
As a conventional electromagnetic overcurrent tripping device of this type, for example, the one shown in Patent Document 1 is known.

An electromagnetic overcurrent tripping device for a circuit breaker shown in Patent Document 1 is vertically fixed to one side leg piece of an L-shaped yoke and has an armature and a coil for passing an electric current. Oil dash pot, movable iron piece swingably supported on the other leg piece end of the yoke, and when the coil current becomes excessive, it is attracted to the armature and pulled off, and the inner wall of the other leg piece of the yoke And a magnetic flux bypass leakage iron piece having an opposite edge.
The magnetic flux bypass leakage iron piece is located between the coil of the oil dashpot and the armature, and is attached to the bobbin around which the coil is wound while being pressed by a spring via an insulating washer. In the electromagnetic overcurrent tripping device of Patent Document 1, a magnetic flux bypass leakage iron piece is attached to the magnetic circuit of the electromagnetic overcurrent tripping device, and a part of the magnetic flux is bypassed to the magnetic flux bypass leakage iron piece, Delayed operation characteristics are given.

Further, as another conventional electromagnetic overcurrent tripping device provided with delay operation characteristics, for example, the one shown in Patent Document 2 is also known.
An electromagnetic overcurrent tripping device for a circuit breaker shown in Patent Document 2 includes an L-shaped yoke, a movable iron piece related to a trip mechanism, a coil wound around a hooked bobbin, an oil dashpot with an armature, and A concave groove is formed on the plate surface, and a magnetic flux bypass leakage iron piece interposed from the side is assembled between the armature and the upper side flange of the bobbin. The leakage iron piece for magnetic flux bypass has stepped engagement legs on the left and right ends of the base, and the leakage iron piece for magnetic flux bypass has its engagement leg on the back side of the upper side collar of the bobbin. It is inserted and locked in place.

Japanese Utility Model Publication No. 63-102161 JP-A-11-144600

However, the conventional circuit breaker electromagnetic overcurrent trip devices disclosed in Patent Document 1 and Patent Document 2 have the following problems.
That is, the electromagnetic overcurrent tripping devices for circuit breakers shown in Patent Document 1 and Patent Document 2 both have a structure in which a leakage iron piece for magnetic flux bypass is attached to a bobbin around which a coil is wound.

  On the other hand, in the case of a circuit breaker electromagnetic overcurrent tripping device having a large rated current (for example, a rated current of about 100 A), the coil cannot be thinned and wound on a bobbin. Possible coils cannot be used. In other words, since the linear shape of the coil becomes as thick as about 5 mm, in the case of an electromagnetic overcurrent tripping device for a circuit breaker having a specification with a large rated current, the thick coil cannot be wound around the bobbin. Cannot be used.

Accordingly, in the electromagnetic overcurrent tripping device for circuit breakers having a specification with a large rated current, as in the electromagnetic overcurrent tripping device for circuit breakers shown in Patent Literature 1 and Patent Literature 2, the magnetic flux bypass device is used. A leaking iron piece cannot be attached to a bobbin wrapped with a coil.
Accordingly, the present invention has been made to solve this conventional problem, and an object of the present invention is to provide a magnetic flux bypass in an electromagnetic overcurrent tripping device for a circuit breaker without a bobbin for winding a coil. An object of the present invention is to provide an electromagnetic overcurrent tripping device for a circuit breaker capable of fixing a leakage iron piece in a predetermined position and a method for manufacturing the same.

  In order to achieve the above object, an electromagnetic overcurrent tripping device for a circuit breaker according to one aspect of the present invention includes an L-shaped yoke attached to a unit case, and an L-shaped yoke. An oil dashpot that is vertically fixed to the upper leg piece and has an armature attached to the lower end, a coil wound directly around the oil dashpot, and a lower side of the L-shaped yoke A movable iron piece swingably supported at the lower end of the leg piece, a magnetic flux bypass leakage iron piece for bypassing a part of the magnetic flux flowing through the magnetic circuit, and holding the magnetic flux bypass leakage iron piece in a predetermined position, A gist is provided with a holder that is disposed between a coil and the armature and that disposes the magnetic flux bypass leakage iron piece between the coil and the armature.

  In addition, a method for manufacturing an electromagnetic overcurrent tripping device for a circuit breaker according to another aspect of the present invention includes an L-shaped yoke and a lower leg of a lower leg piece of the L-shaped yoke in a unit case. After the step of assembling the yoke, in which the movable iron piece supported so as to be swingable at the part is installed, the leakage iron piece holding step for holding the magnetic flux bypass leakage iron piece in a predetermined position inside the holder, and after the leakage iron piece holding step A holder placement step of placing the holder holding the magnetic flux bypass leakage iron piece above the armature of an oil dashpot with an armature attached to a lower end; and after the holder placement step, a coil is placed on the holder. A coil winding step in which the coil is wound directly around the oil dash pot, and a coil unit in which the coil is directly wound around the oil dash pot on the holder after the coil winding step. A coil unit assembling step, wherein the holder is attached to the unit case, and the oil dashpot is vertically fixed to the upper leg piece of the L-shaped yoke. It is made to include.

  Furthermore, a method for manufacturing an electromagnetic overcurrent tripping device for a circuit breaker according to another aspect of the present invention includes a unit case having an L-shaped yoke and a lower leg of a lower leg piece of the L-shaped yoke. A yoke assembling step of incorporating a movable iron piece supported in a swingable manner at the part, a holder arranging step of arranging the holder above the armature of the oil dashpot with the armature attached to the lower end, After the holder placement step, the leakage iron piece holding step for holding the magnetic flux bypass leakage iron piece at a predetermined position on the upper surface of the holder; and after the leakage iron piece holding step, the coil is placed on the magnetic flux bypass leakage iron piece in the oil dashpot. A coil winding process in which the coil is wound directly around the oil dash pot on the magnetic flux bypass leakage iron piece after the coil winding process. Is installed in the unit case. At this time, the holder is attached to the unit case, and the oil dash pot is vertically penetrated and fixed to the upper leg piece of the L-shaped yoke. Including the above.

  According to an electromagnetic overcurrent tripping device for a circuit breaker and a method for manufacturing the same according to the present invention, in an electromagnetic overcurrent tripping device for a circuit breaker without a bobbin for winding a coil, An electromagnetic overcurrent tripping device for a circuit breaker that can be fixed at a predetermined position and a method for manufacturing the same.

1 is a plan view of a circuit breaker incorporating an electromagnetic overcurrent tripping device according to a first embodiment of the present invention. However, FIG. 1 shows a state where the handle is in the on position. It is sectional drawing which follows the 2-2 line of FIG. However, in FIG. 2, the leakage iron piece for magnetic flux bypass and the holder are indicated by a one-dot chain line. 1 is a plan view of a circuit breaker incorporating an electromagnetic overcurrent tripping device according to a first embodiment of the present invention. However, FIG. 3 shows a state in which the handle is in the off position. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. However, in FIG. 4, the leakage iron piece for magnetic flux bypass and the holder are indicated by a one-dot chain line. It is sectional drawing which shows typically the state before the movable iron piece of the electromagnetic overcurrent tripping device which concerns on 1st Embodiment of this invention rock | fluctuates. However, in FIG. 5, the leakage iron piece for magnetic flux bypass and the holder are indicated by a one-dot chain line. It is sectional drawing which shows typically the state after the movable iron piece of the electromagnetic overcurrent tripping device which concerns on 1st Embodiment of this invention rock | fluctuates. However, in FIG. 6, the leakage iron piece for magnetic flux bypass and the holder are indicated by a one-dot chain line. It is a perspective view of a holder used for an electromagnetic overcurrent trip device concerning a 1st embodiment of the present invention. It is sectional drawing which follows the 8-8 line of FIG. It is the perspective view which looked at the leakage iron piece for magnetic flux bypass used for the electromagnetic overcurrent tripping device concerning a 1st embodiment of the present invention from the slanting upper part. It is the perspective view which looked at the leakage iron piece for magnetic flux bypass used for the electromagnetic overcurrent tripping device which concerns on 1st Embodiment of this invention from diagonally downward. It is a perspective view which shows a part of unit case for demonstrating the manufacturing method of the electromagnetic overcurrent trip apparatus which concerns on 1st Embodiment of this invention. FIG. 10 is a perspective view of a state in which the magnetic flux bypass leakage iron piece shown in FIG. 9 is held by the holder shown in FIG. 7. It is a figure for demonstrating the process of arrange | positioning the holder holding the leakage iron piece for magnetic flux bypass above the armature of the oil dashpot which attached the armature to the lower end. It is a perspective view of the state which has arranged the holder holding the leakage iron piece for magnetic flux bypass above the armature of the oil dashpot which attached the armature to the lower end. It is a perspective view of the state where the coil was directly wound around the oil dash pot above the holder. It is a figure for demonstrating the process of incorporating what wound the coil directly around the oil dashpot above the holder in a unit case. It is a perspective view of the electromagnetic overcurrent tripping device incorporated in the unit case. It is the perspective view which looked at the holder used for the electromagnetic overcurrent tripping device which concerns on 2nd Embodiment of this invention from diagonally upward. It is the perspective view which looked at the holder used for the electromagnetic overcurrent tripping device which concerns on 2nd Embodiment of this invention from diagonally downward. It is the perspective view which looked at the leakage iron piece for magnetic flux bypass used for the electromagnetic overcurrent tripping device which concerns on 2nd Embodiment of this invention from diagonally upward. It is the perspective view which looked at the leakage iron piece for magnetic flux bypass used for the electromagnetic overcurrent tripping device which concerns on 2nd Embodiment of this invention from diagonally downward. It is a figure for demonstrating the process of arrange | positioning the holder shown in FIG. 18 above the armature of the oil dashpot which attached the armature to the lower end. FIG. 19 is a perspective view of a state where the holder shown in FIG. 18 is arranged above the armature of the oil dashpot with the armature attached to the lower end. It is a figure for demonstrating the process of hold | maintaining the leakage iron piece for magnetic flux bypass shown in FIG. 20 with a holder. It is a perspective view of the state where the leakage iron piece for magnetic flux bypass was held with the holder.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
A circuit breaker incorporating the electromagnetic overcurrent tripping device according to the first embodiment of the present invention is shown in FIGS. 1 to 4, and the circuit breaker 1 is placed in a unit case 2 made of molded resin. , Fixed contact 3, movable contact 5, arc-extinguishing device (not shown), electromagnetic overcurrent tripping device 10, trip mechanism unit 20, and opening / closing mechanism unit 30.

  Here, the unit case 2 is formed in a substantially rectangular parallelepiped shape extending in the up-down direction (up-down direction in FIG. 2), left-right direction (direction orthogonal to the paper surface in FIG. 2), and front-back direction (left-right direction in FIG. 2). In the unit case 2, a plurality of (three in this embodiment) electrode chambers are arranged adjacent to each other in the left-right direction, separated by the phase interval wall 2a (see FIG. 11), and fixed for each electrode chamber. A contact 3 and a movable contact 5 are arranged.

The fixed contact 3 is connected to the power supply side terminal 4 and includes a fixed contact 3a on one side surface.
The movable contact 5 is connected to the load side conductive member 6 by a lead wire (not shown). The load side conductive member 6 is connected to an upper end of a coil 14 described later of the electromagnetic overcurrent tripping device 10, and a lower end of the coil 14 is connected to the load side terminal 7. As a result, the load side conductive member 6 is connected to the load side terminal 7 via the coil 14. Moreover, the movable contact 5 is provided with the movable contact 5a which contacts the fixed contact 3a.

The arc extinguishing device is disposed between the power supply side terminal 4 and the load side terminal 7 in the polar chamber, and extinguishes an arc generated when the movable contact 5a is opened from the fixed contact 3a.
The opening / closing mechanism 30 opens the movable contact 5a of the movable contact 5 from the fixed contact 3a of the fixed contact 3, and causes the fixed contact 3a to close the movable contact 5a. When the handle 31 is moved from the ON position shown in FIGS. 1 and 2 to the OFF position shown in FIGS. 3 and 4, the opening / closing mechanism 30 fixes the movable contact 5 a of the movable contact 5 to the fixed contact 3. A contact opening operation is performed from the contact point 3a so that the power supply side terminal 4 and the load side terminal 7 are not energized. On the other hand, the opening / closing mechanism 30 moves the movable contact 5a of the movable contact 5 to the fixed contact 3 when the handle 31 is moved from the off position shown in FIGS. 3 and 4 to the on position shown in FIGS. The stationary contact 3a is closed so that the power supply side terminal 4 and the load side terminal 7 are energized.

Further, the trip mechanism section 20 causes the opening / closing mechanism section 30 to perform a trip operation when the movable iron piece 15 (to be described later) of the electromagnetic overcurrent tripping device 10 oscillates, so that the movable contact 5a of the movable contact 5 is fixedly contacted. The opening operation is performed from the fixed contact 3a of the child 3.
The electromagnetic overcurrent tripping device 10 detects an overcurrent flowing in a coil 14 described later. As shown in FIG. 17, the electromagnetic overcurrent tripping device 10 includes a tripping device first accommodation chamber 41, a tripping device second accommodation chamber 42, and a tripping device corresponding to each pole chamber of the unit case 2. As shown in FIG. 5, the L-shaped yoke 11, the oil dash pot 12, the armature 13, the coil 14, the movable iron piece 15, and the magnetic flux bypass are housed in the third storage chambers 43. A leakage iron piece 16 and a holder 17 are provided.

  Here, the L-shaped yoke 11 is attached to the tripping device first storage chamber 41, the tripping device second storage chamber 42, and the tripping device third storage chamber 43 corresponding to each pole chamber of the unit case 2. Each is attached. As shown in FIG. 5, the L-shaped yoke 11 includes an upper leg piece 11a and a lower leg piece 11b extending vertically downward from the front end (the left end in FIGS. 2 and 5) of the upper leg piece 11a. ing.

Further, as shown in FIG. 5, the oil dash pot 12 extends in the vertical direction and is fixed to the upper leg piece 11 a of the L-shaped yoke 11 in the vicinity of the upper end. At the lower end of the oil dash pot 12, a flange 12a protruding outward is provided, and an armature 13 is attached.
The coil 14 has a wire diameter of about φ5 mm suitable for a specification with a large rated current (for example, a specification with a rated current of about 100 A), and is wound in advance with a dimension that allows the oil dashpot 12 to be inserted in the center. It is molded into a shape. As shown in FIG. 5, the coil 14 has a shape in which the oil dash pot 12 is inserted in the center and is directly wound around the oil dash pot 12. The load side conductive member 6 is connected to the upper end of the coil 14, and the load side terminal 7 is connected to the lower end of the coil 14.

As shown in FIG. 5, the movable iron piece 15 is formed in an L shape having a tongue piece 15a and a leg piece 15b extending vertically upward from the front end of the tongue piece 15a, and the tongue piece 15a has an L shape. The lower leg 11b of the yoke 11 is swingably supported by the lower end 11c.
Further, the magnetic flux bypass leakage iron piece 16 bypasses a part of the magnetic flux flowing through the magnetic circuit, and will be described in detail later. However, as shown in FIG. Arranged between the coil 14 and the armature 13.

Further, the holder 17 will be described in detail later, and while holding the magnetic flux bypass leakage iron piece 16 in a predetermined position, the holder 17 is disposed between the coil 14 and the armature 13 so as to connect the magnetic flux bypass leakage iron piece 16 to the coil 14. And the armature 13.
In the electromagnetic overcurrent tripping device 10 configured as described above, when an overcurrent (for example, 200% A or more of the rated current) flows through the coil 14, the magnetic flux indicated by the dashed arrow in FIG. The magnetic circuit C flowing through the yoke 11, the movable iron piece 15 and the armature 13 is constituted, and the tongue piece 15a of the movable iron piece 15 is attracted to the armature 13, so that the movable iron piece 15 is joined as shown in FIG. The iron 11 swings around the lower end 11c of the lower leg piece 11b. Thereby, the leg piece 15b of the movable iron piece 15 operates the trip mechanism section 20. As a result, the opening / closing mechanism 30 is tripped, the movable contact 5a of the movable contact 5 is opened from the fixed contact 3a of the fixed contact 3, and the power supply side terminal 4 and the load side terminal 7 are not energized. It becomes a state.

  On the other hand, since the starting current of the electric motor varies depending on the load equipment, it is not possible to specify a numerical value in general. When flowing, a part of the magnetic flux flowing through the magnetic circuit C by the magnetic flux bypassing leakage iron piece 16 is bypassed B as shown by the solid line arrow in FIG. The 15 tongue pieces 15 a are not attracted by the armature 13. For this reason, the movable iron piece 15 does not malfunction.

Next, the configuration of the holder 17 will be described in detail with reference to FIGS.
As shown in FIG. 7, the holder 17 includes a substantially rectangular parallelepiped holder body 17 a having an upper surface formed so that the plate thickness gradually increases from the rear side (right side in FIG. 7) to the front side. The front side of the holder body 17a is the side facing the lower leg piece 11b of the L-shaped yoke 11. And the holder main body 17a is formed by shape | molding an insulating synthetic resin, and the through-hole 17b penetrated to an up-down direction is formed in the part from the slightly rear side of the holder main body 17a. The diameter of the through hole 17b is set to a diameter that allows the oil dash pot 12 to be inserted vertically.

  Further, as shown in FIG. 8, the holder body 17a is provided with a slit 17c formed so as to be orthogonal to the through hole 17b from the front surface toward the through hole 17b. The slit 17c extends so as to penetrate the holder main body 17a in the left-right direction (a direction orthogonal to the paper surface in FIG. 8). A magnetic flux bypass leakage iron piece 16 can be inserted into the slit 17c from the front side. Further, a pair of holding projections 17d (only one holding projection is shown in FIG. 8) for positioning and holding the magnetic flux bypassing leakage iron piece 16 is provided at the bottom of the slit 17c of the holder body 17a.

  Further, a protrusion 17e that protrudes downward and extends in the front-rear direction is provided on the lower surface of the right end of the holder body 17a, and a positioning post 17f is provided at the front end of the protrusion 17e. Further, a step portion 17g extending in the front-rear direction is provided above the protrusion 17e at the right end portion of the holder body 17a. The functions of the protrusion 17e, the positioning post 17f, and the step portion 17g will be described later.

Next, the configuration of the magnetic flux bypass leakage iron piece 16 will be described with reference to FIGS.
The magnetic flux bypass leakage iron piece 16 is formed by punching an iron plate and includes a substantially rectangular plate-like base portion 16a. And the edge part 16b is formed in the front side (left side in FIG. 9) of the base part 16a, ie, the side facing the lower leg piece 11b of the L-shaped yoke 11. On the other hand, an arc-shaped notch 16c is formed on the rear side of the base portion 16a, that is, on the oil dash pot 12 side. Further, a pair of holding holes 16d are provided in the vicinity of both ends of the base portion 16a in the left-right direction (vertical direction in FIG. 9). When the magnetic flux bypass leakage iron piece 16 is inserted into the slit 17c of the holder 17 in each holding hole 16d, each holding projection 17d of the holder 17 enters, and the magnetic flux bypass leakage iron piece 16 is positioned and held with respect to the holder 17. The

Next, a manufacturing method, that is, an assembling method of the electromagnetic overcurrent tripping device 10 configured as described above will be described with reference to FIGS.
When assembling the electromagnetic overcurrent tripping device 10, first, as shown in FIG. 11, the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation of the unit case 2. In each of the chambers 43, an L-shaped yoke 11 and a movable iron piece 15 supported in a swingable manner at the lower end of the lower leg 11b of the L-shaped yoke 11 are incorporated (incorporating the yoke). Process). At this time, the L-shaped yoke 11 is assembled while being positioned with respect to the unit case 2.

  Next, as shown in FIG. 12, the magnetic flux bypass leakage iron piece 16 is held at a predetermined position inside the holder 17 (leakage iron piece holding step). At this time, the magnetic flux bypass leakage iron piece 16 is inserted into the slit 17 c of the holder 17 from the front side of the holder 17 with the rear side (side with the notch 16 c) as the head. Then, each holding projection 17d enters each holding hole 16d of the magnetic flux bypassing leakage iron piece 16, and the magnetic flux bypassing leakage iron piece 16 is positioned and held with respect to the holder 17. The rear side of the magnetic flux bypass leakage iron piece 16, that is, the notch 16c faces the through hole 17b.

  And as shown in FIG.13 and FIG.14, the holder 17 holding the leakage iron piece 16 for magnetic flux bypass is arrange | positioned above the armature 13 of the oil dashpot 12 which attached the armature 13 to the lower end (holder arrangement | positioning process) ). At this time, the holder 17 is disposed on the flange 12 a of the oil dash pot 12 by inserting the through hole 17 b of the holder 17 from the upper end of the oil dash pot 12. Here, since the magnetic flux bypass leakage iron piece 16 is positioned with respect to the holder 17, it is between the notch 116c facing the through hole 17b and the oil dash pot 12 inserted through the through hole 17b. The interval is held at a predetermined interval.

  Next, as shown in FIG. 15, the coil 14 is directly wound around the oil dash pot 12 on the holder 17 (coil winding step). At this time, since the coil 14 is formed in a shape wound in advance so that the oil dash pot 12 can be inserted into the center, the coil 14 is inserted through the center of the coil 14 from the upper end of the oil dash pot 12 to the coil 14 holder 17. Place on top. In addition, the load side terminal 7 is previously connected to the lower end of the coil 14 by brazing. When the coil 14 is inserted into the oil dash pot 12, the load-side terminal 7 is placed on the opposite side (rear side) to the magnetic flux bypass leakage iron piece 16 held by the holder 17. Thus, the coil unit U is completed as shown in FIG. 15 by winding the coil 14 directly around the oil dash pot 12 on the holder 17. Three coil units U are prepared so as to be incorporated in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 of the unit case 2.

Finally, as shown in FIGS. 16 and 17, the three coil units U in which the coil 14 is directly wound around the oil dash pot 12 on the holder 17 are attached to the trip unit first accommodation chamber 41 of the unit case 2. The tripping device second storage chamber 42 and the tripping device third storage chamber 43 are incorporated into each of them (coil unit assembly step).
At this time, in each coil unit U, the coil unit U is advanced in the direction of the arrow in FIG. The protrusion 17e on the right end side of the holder 17 is formed in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 of the unit case 2. The stepped portion 17g on the right end side of the holder 17 is moved along the stepped portion 41c (in FIG. 16, only the stepped portion 41c formed in the tripped device first containing chamber 41 is shown). The right pedestal surface 41a formed in each of the tripping device second storage chamber 42 and the tripping device third storage chamber 43 (in FIG. 16, the right pedestal surface formed in the tripping device first storage chamber 41) The lower surface on the left end side of the holder 17 is formed in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 along the line 41a. Left pedestal surface 41b (in FIG. Shows the coil unit U along the left pedestal surface 41b formed in the tripping device first accommodation chamber 41), the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device. It is accommodated in each of the third accommodation chambers 43. The positioning post 17f of the holder 17 is formed in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 of the unit case 2 (not shown). Insert into the positioning hole. Thereby, the holder 17 of each coil unit U is positioned and attached to the unit case 2.

Further, in the coil unit assembly process, the upper end portion of the oil dash pot 12 in each coil unit U is vertically fixed to the upper leg piece 11a of each L-shaped yoke 11 in the vertical direction. That is, the upper end portion of the oil dash pot 12 in each coil unit U is press-fitted into the upper leg piece 11 a of each L-shaped yoke 11.
Thereby, the electromagnetic overcurrent tripping device 10 is assembled. In the assembled electromagnetic overcurrent tripping device 10, the magnetic flux bypass leakage iron piece 16 is positioned with respect to the holder 17, the holder 17 is positioned with respect to the unit case 2, and the L-shaped yoke is provided. 11 is assembled in a state of being positioned with respect to the unit case 2, the distance between the magnetic flux bypass leakage iron piece 16 and the lower leg piece 11 b of the L-shaped yoke 11 is maintained at a predetermined distance. The

  Thus, according to the electromagnetic overcurrent tripping device 10 for a circuit breaker and the manufacturing method thereof according to the first embodiment, the holder 17 holds the leakage iron piece 16 for magnetic flux bypass in a predetermined position and the oil dash. It is arranged between the coil 14 wound directly around the pot 12 and the armature 13 provided at the lower end of the oil dash pot 12, and the magnetic flux bypass leakage iron piece 16 is connected between the coil 14 and the armature 13. In the circuit-type circuit breaker electromagnetic overcurrent tripping device 10 having no bobbin around which the coil is wound, the circuit-type circuit breaker electromagnetic overload capable of fixing the magnetic flux bypass leakage iron piece 16 at a predetermined position. A current trip device and a method for manufacturing the same can be provided.

  Further, in the electromagnetic overcurrent tripping device 10 of the circuit breaker according to the first embodiment, the holder 17 penetrates in the vertical direction of the holder body 17a, and the through hole 17b through which the oil dash pot 12 can be inserted in the vertical direction The magnetic flux bypass leakage iron piece is formed so as to be orthogonal to the through hole 17b from the surface (front surface) facing the lower leg piece 11b of the L-shaped yoke 11 of the holder body 17a toward the through hole 17b. 16 and a holding projection 17d for positioning and holding the magnetic flux bypass leakage iron piece 16 provided at the bottom of the slit 17c of the holder body 17a.

  Moreover, in the electromagnetic overcurrent tripping device 10 of the first embodiment, the magnetic flux bypass leakage iron piece 16 includes the base portion 16a and the side of the base portion 16a facing the lower leg piece 11b of the L-shaped yoke 11. An edge portion 16b provided on the base portion 16a, a notch 16c provided on the oil dash pot 12 side of the base portion 16a, and a holding hole 16d provided on the bottom portion of the slit 17c provided in the base portion 16a. I have.

For this reason, the leakage iron piece 16 for magnetic flux bypass has the notch 16c side as the head, the slit 17c of the holder 17 faces the lower leg piece 11b of the L-shaped yoke 11 of the holder 17 (front side) side Is inserted into the holding hole 16d of the leakage iron piece 16 for magnetic flux bypass, and positioning and holding of the leakage iron piece 16 for magnetic flux bypass with respect to the holder 17 can be performed.
Then, after the magnetic flux bypass leakage iron piece 16 is held inside the holder 17, the holder 17 holding the magnetic flux bypass leakage iron piece 16 is inserted into the through hole 17 b of the holder 17 from the upper end of the oil dash pot 12. 13 above.

(Second Embodiment)
Next, an electromagnetic overcurrent tripping device for a circuit breaker according to a second embodiment of the present invention will be described with reference to FIGS.
Here, the electromagnetic overcurrent tripping device for the circuit breaker according to the second embodiment has the same basic configuration as the electromagnetic overcurrent tripping device 10 according to the first embodiment shown in FIGS. However, it differs from the electromagnetic overcurrent tripping device 10 according to the first embodiment in the configuration of the holder, the configuration of the magnetic flux bypass leakage iron piece, and the assembly method of the electromagnetic overcurrent tripping device.

  That is, as shown in FIGS. 18 and 19, the holder 19 used in the electromagnetic overcurrent tripping device for the circuit breaker according to the second embodiment is substantially formed by molding an insulating rigid resin. A rectangular parallelepiped holder main body 19a is provided. A through-hole 19b penetrating in the vertical direction is formed in a portion slightly rearward (right side in FIG. 18) of the holder main body 19a. The diameter of the through hole 19b is set to a diameter that allows the oil dash pot 12 (see FIGS. 22 and 23) to be inserted vertically. The front side of the holder body 19a is the side facing the lower leg piece 11b (see FIG. 16) of the L-shaped yoke 11.

  As shown in FIG. 18, the holder main body 19a is provided with a communication passage 19c extending from the front surface of the holder main body so as to communicate with the through hole 19b and penetrating in the vertical direction. By this communication path 19c, the holder 19 can be attached to the oil dash pot 12 from the front side of the communication path 19c. In addition, a pair of holding projections 19d are formed on the upper surface of the holder main body 19a so as to protrude into a holding hole 18d of a magnetic flux bypassing leakage iron piece 18 to be described later to position and hold the magnetic flux bypassing leakage iron piece 18.

  Furthermore, a guide portion 19e extending in the front-rear direction is provided on the lower surface of the right end portion of the holder body 19a, and a positioning post 19f is provided at the front end of the guide portion 19e. Further, a step portion 19g extending in the front-rear direction is provided at the right end portion of the holder main body 19a, and a step portion 19h extending in the front-rear direction is provided at the left end portion of the holder main body 19a. The functions of the guide portion 19e, the positioning post 19f, the step portion 19g, and the step portion 19h will be described later.

  Next, as shown in FIGS. 20 and 21, the magnetic flux bypass leakage iron piece 18 used in the electromagnetic overcurrent tripping device of the circuit breaker according to the second embodiment is formed by punching an iron plate. The base 18a has a substantially rectangular plate shape. And the edge part 18b is protrudingly formed in the front side (left side in FIG. 20) of the base part 18a, ie, the side facing the lower leg piece 11b of the L-shaped yoke 11. As shown in FIG. On the other hand, an arc-shaped notch 18c is formed on the rear side of the base portion 18a, that is, on the oil dash pot 12 side. Further, a pair of holding holes 18d are provided in the vicinity of both ends in the left-right direction (vertical direction in FIG. 20) of the base 18a. When attaching the magnetic flux bypass leakage iron piece 18 from the upper surface of the holder 19 to each holding hole 18d, each holding projection 19d of the holder 19 enters and positions and holds the magnetic flux bypass leakage iron piece 18.

Next, a manufacturing method, that is, an assembling method of the electromagnetic overcurrent tripping device according to the second embodiment will be described with reference to FIGS. 22 to 25, 11, and 15 to 17.
When assembling the electromagnetic overcurrent trip device, first, as in the electromagnetic overcurrent trip device according to the first embodiment, as shown in FIG. The lower end of the lower leg 11b of the L-shaped yoke 11 and the lower leg 11b of the L-shaped yoke 11 is swingable in each of the second tripping chamber 42 and the third tripping chamber 43 of the trip device. The movable iron piece 15 supported by the is assembled (a yoke assembling step). At this time, the L-shaped yoke 11 is assembled while being positioned with respect to the unit case 2.

  Next, unlike the electromagnetic overcurrent tripping device according to the first embodiment, as shown in FIGS. 22 and 23, the holder 19 is located above the armature 13 of the oil dashpot 12 with the armature 13 attached to the lower end. (Holder placement step). At this time, the holder 19 may be mounted on the oil dash pot 12 from the front side of the communication path 19c and disposed on the flange 12a, or the through hole 19b of the holder 19 may be inserted from the upper end of the oil dash pot 12. The holder 19 may be disposed on the flange 12a of the oil dash pot 12.

  Thereafter, unlike the electromagnetic overcurrent tripping device according to the first embodiment, as shown in FIGS. 24 and 25, the magnetic flux bypass leakage iron piece 18 is held at a predetermined position on the upper surface of the holder 19 (leakage iron piece holding step). ). At this time, the holding hole 18 d of the magnetic flux bypassing leakage iron piece 18 is inserted into the holding projection 19 d of the holder 19 from above the holder 19, and the magnetic flux bypassing leakage iron piece 18 is positioned and held with respect to the holder 19. Thereby, the space | interval between the notch 18c of the leakage iron piece 18 for magnetic flux bypass and the oil dashpot 12 is hold | maintained at predetermined spacing.

  Next, almost as in the electromagnetic overcurrent tripping device according to the first embodiment, as shown in FIG. 15 (in FIG. 15, instead of the magnetic flux bypass leakage iron piece 18 and the holder 19, the magnetic flux bypass leakage iron piece 16 and The holder 17 is shown), and the coil 14 is directly wound around the oil dash pot 12 on the magnetic flux bypass leakage iron piece 18 (coil winding step). At this time, since the coil 14 is formed in a shape wound in advance so that the oil dash pot 12 can be inserted into the center, the coil 14 is inserted through the center of the coil 14 from the upper end of the oil dash pot 12 and the magnetic flux is passed through the coil 14. It arrange | positions on the leakage iron piece 18 for bypass. In addition, the load side terminal 7 is previously connected to the lower end of the coil 14 by brazing. When the coil 14 is inserted into the oil dash pot 12, the load side terminal 7 is arranged on the opposite side (rear side) to the magnetic flux bypass leakage iron piece 18. Thus, the coil unit is completed by winding the coil 14 directly around the oil dash pot 12 on the leakage iron piece 18 for magnetic flux bypass. Three coil units are prepared so that they can be incorporated into the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 of the unit case 2, respectively.

  Finally, in substantially the same manner as the electromagnetic overcurrent tripping device according to the first embodiment, FIGS. 16 and 17 (FIG. 16 and FIG. 17 show a magnetic flux bypass leakage instead of the magnetic flux bypass leakage iron piece 18 and the holder 19. As shown in FIG. 3, the iron piece 16 and the holder 17 are shown), the three coil units in which the coil 14 is directly wound around the oil dash pot 12 on the leakage iron piece 18 for magnetic flux bypass are removed from the unit case 2. It is incorporated in each of the device first storage chamber 41, the trip device second storage chamber 42, and the trip device third storage chamber 43 (coil unit assembly step).

  At this time, in each coil unit, the coil unit is advanced in the direction of the arrow in FIG. And the guide part 19e of the right end side of the holder 19 was formed in each of the trip device first accommodation chamber 41, the trip device second accommodation chamber 42, and the trip device third accommodation chamber 43 of the unit case 2. The step portion 19g on the right end side of the holder 19 is connected to the tripping device first storage chamber 41 along the step portion 41c (in FIG. 16, only the step portion 41c formed in the tripping device first storage chamber 41 is shown). The right pedestal surface 41a formed in each of the tripping device second storage chamber 42 and the tripping device third storage chamber 43 (in FIG. 16, the right pedestal surface formed in the tripping device first storage chamber 41) A step portion 19h on the left end side of the holder 19 is formed in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 along only 41a. Left pedestal surface 41b (FIG. 1 In FIG. 1, only the left pedestal surface 41b formed in the tripping device first accommodation chamber 41 is shown), the coil unit is tripped, the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device. It is accommodated in each of the third accommodation chambers 43. The positioning post 19f of the holder 19 is formed in each of the tripping device first accommodation chamber 41, the tripping device second accommodation chamber 42, and the tripping device third accommodation chamber 43 of the unit case 2 (not shown). Insert into the positioning hole. Thereby, the holder 19 of each coil unit is positioned and attached to the unit case 2.

In addition, during the coil unit assembly process, the upper end portion of the oil dash pot 12 in each coil unit is vertically fixed to the upper leg piece 11a of each L-shaped yoke 11 in the vertical direction. That is, the upper end portion of the oil dash pot 12 in each coil unit is press-fitted into the upper leg piece 11 a of each L-shaped yoke 11.
Thereby, the electromagnetic overcurrent tripping device according to the second embodiment is assembled. In the assembled electromagnetic overcurrent trip device, the magnetic flux bypass leakage iron piece 18 is positioned with respect to the holder 19, the holder 19 is positioned with respect to the unit case 2, and the L-shaped yoke 11. Is assembled in a state of being positioned with respect to the unit case 2, the distance between the magnetic flux bypass leakage iron piece 18 and the lower leg piece 11b of the L-shaped yoke 11 is maintained at a predetermined distance. .

  Thus, according to the electromagnetic overcurrent tripping device for a circuit breaker and the manufacturing method thereof according to the second embodiment, the holder 19 holds the magnetic flux bypass leakage iron piece 18 in a predetermined position, and the oil dashpot. 12 is arranged between a coil 14 wound directly around 12 and an armature 13 provided at the lower end of the oil dashpot 12, and a magnetic flux bypass leakage iron piece 18 is disposed between the coil 14 and the armature 13. Therefore, in a circuit breaker electromagnetic overcurrent tripping device without a bobbin for winding a coil, an electromagnetic overcurrent tripping circuit breaker that can fix the magnetic flux bypass leakage iron piece 18 at a predetermined position. A detaching device and a manufacturing method thereof can be provided.

  Further, in the electromagnetic overcurrent tripping device of the circuit breaker according to the second embodiment, the holder 19 penetrates in the vertical direction of the holder body 19a, and the through hole 19b through which the oil dash pot 12 can be inserted in the vertical direction; The holder body 19a extends from the surface (front surface) facing the lower leg piece 11b of the L-shaped yoke 11 so as to communicate with the through hole 19b, and is formed so as to penetrate in the vertical direction. A communicating path 19c that can be attached to the oil dash pot 12 from the surface (front surface) side facing the lower leg piece 11b of the yoke 11 and the upper surface of the holder body 19a are formed to protrude, and the leakage iron piece 18 for magnetic flux bypass. And a holding projection 19d for positioning and holding.

  Further, in the electromagnetic overcurrent tripping device of the second embodiment, the magnetic flux bypass leakage iron piece 18 has a base 18a and a surface of the base 18a facing the lower leg piece 11b of the L-shaped yoke 11 ( An edge 18b provided on the front side, a notch 18c provided on the oil dash pot 12 side of the base 18a, and a holding projection 19d provided on the base 18a and projecting from the upper surface of the holder body 19a. And a holding hole 18d to be held.

  For this reason, the holder 19 is attached to the oil dash pot 12 from the surface (front surface) side of the communication path 19c facing the lower leg piece 11b of the L-shaped yoke 11, and the holder 19 is contacted. After being disposed above the pole piece 13, the holding hole 18 d of the magnetic flux bypassing leakage iron piece 18 is inserted into the holding projection 19 d of the holder 19 from the upper side of the holder 19, and the magnetic flux bypassing leakage iron piece 18 is inserted into the holder 19. It can be positioned and held.

That is, the magnetic flux bypass leakage iron piece 18 is held at a predetermined position on the upper surface of the holder 19 after the holder arranging step of arranging the holder 19 above the armature 13 of the oil dash pot 12 with the armature 13 attached to the lower end. It can be set as a leakage iron piece holding process.
For this reason, the magnetic flux bypass leakage iron piece 18 can be removed from the holder 19 after the coil unit in which the coil 14 is directly wound around the oil dash pot 12 on the magnetic flux bypass leakage iron piece 18 is assembled in the unit case 2. The magnetic flux bypass leakage iron piece 18 removed from the holder 19 can be attached to the holder 19. For this reason, since the magnetic flux bypass leakage iron piece 18 can be replaced after the coil unit is assembled in the unit case 2, the thickness and shape of the magnetic flux bypass leakage iron piece 18 can be changed after the coil unit is assembled in the unit case 2. By changing and attaching the leakage iron piece 18 for magnetic flux bypass, the detected current value can be adjusted.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, the holders 17 and 19 hold the magnetic flux bypass leakage iron pieces 16 and 18 in a predetermined position and are disposed between the coil 14 and the armature 13 so as to contact the magnetic flux bypass leakage iron pieces 16 and 18 with the coil 14. What is necessary is just to arrange | position between the poles 13, and it is not necessarily restricted to the example shown in FIG.7 and FIG.8 and FIG.18 and FIG.19.
Moreover, the leakage iron piece for magnetic flux bypasses should just be formed in the shape which bypasses a part of magnetic flux which flows through a magnetic circuit, and is not necessarily restricted to the example shown in FIG.9 and FIG.10 and FIG.20 and FIG.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Unit case 10 Electromagnetic overcurrent tripping device 11 Relay 11a Upper leg piece 11b Lower leg piece 12 Oil dash pot 13 Armature 14 Coil 15 Movable iron piece 16 Leakage iron piece for magnetic flux bypass 16a Base 16b Edge 16c Notch 16d Holding hole 17 Holder 17a Holder body 17b Through hole 17c Slit 17d Holding projection 18 Magnetic flux bypassing leakage iron piece 18a Base 18b Edge 18c Notch 18d Holding hole 19 Holder 19a Holder body 19b Through hole 19d Communication path 19d unit

Claims (7)

  An L-shaped yoke attached to the unit case, an oil dash pot that is vertically fixed to the upper leg piece of the L-shaped yoke, and has an armature attached to the lower end; and the oil dash A coil wound directly around the pot, a movable iron piece swingably supported at the lower end of the lower leg piece of the L-shaped yoke, and a part of the magnetic flux flowing through the magnetic circuit are bypassed. The magnetic flux bypass leakage iron piece and the magnetic flux bypass leakage iron piece are held in a predetermined position, and the magnetic flux bypass leakage iron piece is disposed between the coil and the armature. An electromagnetic overcurrent tripping device for a circuit breaker comprising a holder disposed on the circuit breaker.   The holder penetrates in the vertical direction of the holder main body, the through hole through which the oil dashpot can be inserted in the vertical direction, and the surface facing the lower leg piece of the L-shaped yoke of the holder main body A slit that is formed so as to be orthogonal to the through hole toward the through hole and into which the magnetic flux bypass leakage iron piece can be inserted, and the magnetic flux bypass leakage iron piece provided at the bottom of the slit of the holder body The electromagnetic overcurrent tripping device for a circuit breaker according to claim 1, further comprising a holding projection for positioning and holding the circuit breaker.   The magnetic flux bypass leakage iron piece includes a base, an edge provided on a side of the base facing the lower leg piece of the L-shaped yoke, and an oil dashpot side of the base. 3. The circuit breaker electromagnetic type according to claim 2, further comprising: a notch formed in the base portion and a holding hole held in the holding protrusion provided in the bottom portion of the slit. Overcurrent trip device.   The holder penetrates in the vertical direction of the holder main body, the through hole through which the oil dashpot can be inserted in the vertical direction, and the surface facing the lower leg piece of the L-shaped yoke of the holder main body The holder is attached to the oil dashpot from the side facing the lower leg piece of the L-shaped yoke and extending in a vertical direction so as to communicate with the through-hole. 2. The circuit breaker according to claim 1, further comprising: a communicating path that is enabled, and a holding projection that is formed to protrude from an upper surface of the holder body and positions and holds the leakage iron piece for magnetic flux bypass. Electromagnetic overcurrent trip device.   The magnetic flux bypass leakage iron piece includes a base, an edge provided on the surface of the base facing the lower leg piece of the L-shaped yoke, and the oil dash pot side of the base. 5. The circuit breaker according to claim 4, further comprising: a notch provided in the base, and a holding hole provided in the base portion and held by the holding protrusion protruding from the upper surface of the holder body. Electromagnetic overcurrent trip device. A step of assembling a yoke, in which an L-shaped yoke and a movable iron piece supported in a swingable manner at the lower end of the lower leg piece of the L-shaped yoke are incorporated in the unit case;
A leakage iron piece holding step for holding the leakage iron piece for magnetic flux bypass in a predetermined position inside the holder;
After the leakage iron piece holding step, the holder holding the magnetic flux bypass leakage iron piece is arranged above the armature of the oil dashpot with the armature attached to the lower end,
A coil winding step of winding the coil directly around the oil dashpot on the holder after the holder placing step;
After the coil winding step, a coil unit in which the coil is directly wound around the oil dashpot on the holder is incorporated into the unit case, and at this time, the holder is attached to the unit case, A method of manufacturing an electromagnetic overcurrent tripping device for a circuit breaker, comprising: a coil unit assembling step for vertically fixing the oil dashpot to the upper leg piece of the L-shaped yoke. . A step of assembling a yoke, in which an L-shaped yoke and a movable iron piece supported in a swingable manner at the lower end of the lower leg piece of the L-shaped yoke are incorporated in the unit case;
A holder placement step of placing the holder above the armature of the oil dashpot with the armature attached to the lower end;
A leakage iron piece holding step for holding the magnetic flux bypass leakage iron piece in a predetermined position on the upper surface of the holder after the holder arranging step;
After the leakage iron piece holding step, a coil winding step of winding a coil directly around the oil dash pot on the leakage iron piece for magnetic flux bypass,
After the coil winding step, a coil unit in which the coil is directly wound around the oil dash pot on the magnetic flux bypass leakage iron piece is incorporated in the unit case, and at this time, the holder is attached to the unit case. And a coil unit assembling step for vertically inserting and fixing the oil dashpot to the upper leg piece of the L-shaped yoke, and an electromagnetic overcurrent tripping circuit breaker Device manufacturing method.

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