JP6049004B2 - Holding structure of movable iron pieces in instantaneous tripping device of circuit breaker - Google Patents

Description

The present invention relates to a structure of an instantaneous tripping device in a circuit breaker, and more particularly to a structure for holding a movable iron piece arranged to face a fixed iron core in an instantaneous tripping device using a leaf spring.

As a structure of an instantaneous trip device (electromagnetic trip device) in a circuit breaker, Patent Document 1 is disclosed. Patent Document 1 discloses an electromagnetic trip device that can be downsized and can increase the attractive force of the moveable iron core as compared with a conventional electromagnetic trip device having a structure in which the movable iron core is biased by a torsion coil spring. It is an invention made for the purpose of providing.

The electromagnetic trip device disclosed in Patent Document 1 uses a leaf spring to hold a movable iron core. For example, as described in FIGS. 1 and 2 of Patent Document 1, the movable iron core 58 is fixed. A protrusion (not shown) that protrudes from the surface on the iron core 74 side is inserted into holes 73b and 73b formed in the upper end portion of the central piece 73a of the leaf spring 73 and fixed by caulking, so that the leaf spring 73 can rotate freely. The leaf spring 73 is arranged so that both side pieces 73c, 73c formed by bending on both sides of the central piece 73a are arranged along the outer surfaces of the both side pieces 74a, 74a of the fixed iron core 74, and at the tip of the both side pieces 73c, 73c. A locking piece (not shown) projecting inward is locked to the fixed core 74 by being locked to recesses 74 b and 74 b formed at the outer corners of the fixed core 74.

Further, as described in FIG. 21 of Patent Document 1, the leaf spring 73 is formed in a U shape, and is formed on the inner surface on the free end side of the movable iron core 58 in the central piece arranged on the lower side in the figure. Insertion holes 73b and 73b for inserting and fixing the protrusions 58b and 58b are formed, and protrusions 73e are formed at the tips of the side pieces 73c and 73c by being bent in a direction perpendicular to the plate surface. On the other hand, protrusions 74d are integrally projected upward on the upper end surfaces of both side pieces 74a, 74a of the fixed iron core 74, and protrusions 74e, which are locked portions formed on the inner surfaces of the protrusions 74d, 74d on both sides, are formed on the leaf spring 73. There is one that holds the leaf spring 73 by being inserted into and locked in a locking hole 73f that is a locking portion formed in the protruding piece 73e of the side piece 73c.

Further, as described in FIG. 23 of Patent Document 1, the leaf spring 73 is formed in a U shape, and is formed on the inner side surface on the rotation center side of the movable iron core 58 in the central piece arranged on the upper side in the drawing. An insertion hole 73b for inserting and fixing the projection 58b is formed, and a protruding piece 73e is formed at the tip of the both side pieces 73c and 73c by being bent in a direction perpendicular to the plate surface. On the other hand, a stepped surface is provided on the lower inner surface of both side pieces 74 a of the fixed iron core 74, and protrusions 74 e are integrally projected on the stepped surface, and the protrusions 74 e are formed in locking holes 73 f formed in the protruding pieces 74 e on both sides of the leaf spring 73. There is one that holds the leaf spring 73 by inserting and locking.

Further, as described in FIG. 25 of Patent Document 1, the leaf spring 73 is formed in a U shape, and the vicinity of the base portions of both side pieces 73c and 73c is bent at a right angle, and the movable iron core is formed on the central piece that is vertically suspended in the figure. Insertion holes 73b and 73b for inserting and fixing the projections 58b and 58b formed on both sides of the outer surface in the vicinity of the rotation center 58 are formed, and the ends of the both side pieces 73c and 73c are formed on the rotation center side. A locking hole 73g for fixing to the upper surface of the fixed iron core 74 is formed by inserting and caulking protrusions 74e protruding from the upper surfaces of the both side pieces 74a, 74a of the fixed iron core 74.

Further, as described in FIG. 27 of Patent Document 1, the leaf spring 73 is formed by bending both side pieces 73c so as to have a plate surface perpendicular to the plate surface of the central piece, and the base portion of the both side pieces 73c. After projecting in the direction opposite to the tip direction, it is folded back into a U shape and formed into a substantially U shape. In the figure, projections 58b and 58b formed on the outer surface near the rotation center of the movable iron core 58 are formed on the center piece. Insertion holes 73b and 73b to be inserted and fixed by caulking are formed, and protrusions 74e protruding from the outer side surfaces of both side pieces 74a and 74a of the rotation center side fixed core 74 are inserted at the ends of both side pieces 73c and 73c. Locking holes 73f are formed so as to be locked and fixed to the upper surface of the fixed iron core 74, respectively.

Further, as shown in FIG. 29 of Patent Document 1, a plate spring is formed in a T-shape and a portion that extends from the middle portion to the tip portion of the horizontal piece is an outer surface of both side pieces 74a and 74a of the fixed iron core 74. The side pieces 73c and 73c are bent at right angles to the plate surface of the horizontal piece so as to extend along the horizontal axis. As shown in FIG. In FIG. 2, the two side pieces 73 c and 73 c are arranged along the outer edge of the movable core 58 along the upper edge of the movable core 58, and the both side pieces 73 c and 73 c of the both side end faces of the movable core 58 and the two side pieces 74 a and 74 a of the fixed core 74. A protrusion 74e that protrudes along the outer surface to a position in the vicinity of the rotation center of the outer surface of the both side pieces 74a, 74a is inserted into a locking hole 73f that is drilled in the tip of the side piece 73c. 74e is locked to the fixed iron core 74 On the other hand, the vertical piece located in the middle of the both side pieces 74a, 74a of the fixed iron core 74 is suspended along the outer surface of the movable iron core 58, and the protrusion 58b protruding near the free end of the movable iron core 58 is formed into the vertical piece. The movable iron core 58 is rotatably held by being inserted into an insertion hole 73b drilled in the tip of the lead and crimping the projection 58b.

Further, as described in FIG. 31 of Patent Document 1, the leaf spring is formed in a T shape, and the length in the both end direction of the horizontal piece is formed to be substantially the same as the horizontal width of the movable iron core 58. Furthermore, the length from the upper end to the lower end of the central vertical piece is formed in the height direction of the movable iron core 58, and both ends of the horizontal piece are extended so as to be parallel to the vertical piece, and the tip of the extended piece 32 is extended to the outside at a right angle from a position slightly above the lower end of the vertical piece, and a side piece 73c is formed by bending the vicinity of the base of the extended piece at a right angle. As shown in the drawing, a protrusion 58b protruding from the center of the outer surface near the free end of the movable core 58 is inserted into an insertion hole 73b provided in the lower part of the vertical piece and caulked to be fixed to the movable core 58, and both side pieces 73c are also shown. , 73c along the side surface of the movable iron core 58, both side pieces 74 of the fixed iron cores 74, 74. , 74a are arranged along the outer surface of 74a, and are fixed to the fixed core 74 side by being inserted and locked into the locking holes 73f of the side pieces 73c on the projections 74e protruding from the outer surfaces of the both side pieces 74a, 74a. It is something like that.

Further, as described in FIG. 33 of Patent Document 1, the vertical piece including the connecting piece of the fixed iron core 74 and the vertical piece is bent at a substantially right angle and extends outward from the free end of the movable iron core 58. An iron plate having a flat plate 75 as a horizontal piece is provided, and one leaf spring 73 is extended upward from the base piece, two L-shaped pieces 73h extending upward from the outer edge of the base piece, and from the inner piece. 34, and is arranged so that the rotation center side of the movable iron core 58 is the base piece side between the vertical piece 73i and the L-shaped piece 73h as shown in FIG. Then, a projection 58b projecting from the inside of the fixed core 74 of the movable iron core 58 and in the vicinity of the free end side is inserted and locked from the inside into a locking hole 73j provided at the tip of the vertical piece 73i. The upper part of the vertical piece part of the L-shaped piece 233 is outwardly provided by the vertical penetration provided on both sides of the flat plate 75 of the iron plate. A notch 73l provided in the inner edge of the horizontal piece 73k of both L-shaped pieces 73h and 73h is placed on the horizontal piece of the iron plate and fitted to the mouthed recess 74f. The movable iron core 58 is rotatably held by being fixed to the iron plate by engaging with a projection 74g projecting on a horizontal piece of the iron plate. Thus, various forms of electromagnetic trip devices have been disclosed.

JP 2001-35342 A (FIGS. 1 and 2)

According to the electromagnetic trip device described in Patent Document 1, it is possible to provide an electromagnetic trip device that can be reduced in size and can increase the attractive force of the movable iron core as compared with a conventional electromagnetic trip device. However, when focusing on the workability of the leaf spring and the assembly, performance, and adjustability of the electromagnetic trip device, it is accompanied by bending work when the leaf spring is formed, Since the caulking and fixing directions are different, processing costs and assembly costs may be high. In addition, it is necessary to strictly manage the dimensions associated with the bending process, and if the bending dimensions vary, there may be variations in the expected performance of the electromagnetic trip device. In this case, it may be necessary to adjust the bending angle of the leaf spring, but there is a risk that the yield of the product may be lowered in combination with the difficulty in correcting the mold for adjusting the bending angle. In addition, because of this, it is difficult to adjust the operation performance of the electromagnetic trip device due to the difference in rating.

Therefore, in view of the above problems, the present invention provides instantaneous tripping that can be easily adjusted even when adjusting the performance of an electromagnetic trip device, in which the workability of the leaf spring is good and stable mass production performance can be maintained. An object is to provide an apparatus.

The holding structure of the movable iron piece of the instantaneous tripping device of the circuit breaker according to the present invention is configured to solve the above-mentioned problem, and the holding structure of the movable iron piece according to claim 1 is configured of conductors facing each other. On one side, the yoke is arranged so as to surround the one conductor,
Includes a perforated portion to the displacement of the leaf spring which is formed in a plate substantially rectangular in other conductor that was placed a plate spring that attaching the movable iron piece to the yoke facing one end portion of the leaf spring Is configured as a feature.

According to such a configuration, since the leaf spring is formed in a substantially rectangular shape and the displacement portion of the leaf spring has a simple shape without bending, the workability is good and the stable mass production performance is maintained. be able to. In addition, by changing the size of the perforated part while maintaining the plate thickness of the leaf spring, the sectional area of the leaf spring in the displacement direction can be changed, so that the spring constant of the leaf spring can be easily changed, and the electromagnetic tripping Even when adjusting the performance of the apparatus, it is possible to provide an instantaneous trip apparatus that can be easily adjusted.

The invention according to claim 2 is characterized in that the movable iron piece is attached substantially parallel to the leaf spring.

According to the second aspect of the present invention, when the movable iron piece is attached to the leaf spring, it can be attached in a state where it is overlapped at a predetermined position. Can be improved. Because variations during assembly are less likely to occur, stable mass production performance can be maintained.

The invention according to claim 3 is characterized in that the perforated portion is formed in an elongated shape in the extending direction of the leaf spring.

According to the invention described in claim 3, when the shape of the die for drilling forming the perforated portion can be simplified to improve workability, and the performance of the electromagnetic trip device can be adjusted. The spring constant can be changed by changing the length or width in the extending direction of the perforated part, and an instantaneous trip device that can be easily adjusted can be provided.

According to the present invention, it is possible to provide an instantaneous trip device that has good workability of a leaf spring, can maintain stable mass production performance, and can be easily adjusted even when adjusting the performance of an electromagnetic trip device. Can do.

The perspective view of the circuit breaker which showed 1st Embodiment is shown. The perspective view when taking out the instantaneous tripping device concerning the embodiment is shown. The side view of the instantaneous trip apparatus which concerns on the embodiment is shown. The exploded perspective view of the instantaneous trip device concerning the embodiment is shown. An explanatory view in a conventional example is shown.

Next, the holding structure of the movable iron piece of the instantaneous tripping device according to the present invention will be described in detail with reference to FIGS. Embodiment demonstrates the case where the holding structure of the movable iron piece of the instantaneous trip apparatus of this invention is applied to a 2 pole type | mold circuit breaker.

(First embodiment)
(Description of circuit breaker)
FIG. 1 shows a circuit breaker 1 constructed using a movable iron piece holding structure of an instantaneous tripping device of the present invention. The circuit breaker 1 has shown the internal structure in the state which removed one case among the cases which mutually overlap and comprise a vessel body. The circuit breaker 1 is a two-pole circuit breaker used as a branch circuit breaker of a distribution board, and is interposed in a single-phase three-wire circuit or a single-phase two-wire circuit depending on the connection form of the distribution board. Supply power to the load side.

Hereinafter, in the longitudinal direction of the circuit breaker, the side provided with the power supply side terminal portion indicated by 105 in the figure is the power supply side, and the opposite side of the power supply side is the load side. The side on which the operation handle 103 for operating the circuit breaker 1 is provided is the front side, the side attached to the mounting plate for mounting and fixing the circuit breaker is the bottom side, and the left and right wire insertion holes 105 and 106 are connected. The description will be made with the direction as the width direction.

The case of the circuit breaker 1 is made of a resin material and is divided in the longitudinal direction. When the divided case is a first case (not shown) and a second case 102 facing the first case in the width direction, these cases are overlapped from both sides in the width direction to form the circuit breaker 1. An outer shell, that is, a container is formed.

Each part which comprises the circuit breaker 1 is arrange | positioned in the predetermined position in a case. The case is formed with a component placement portion for placing each component. In the circuit breaker 1, various components are placed on the second case 102, and the first case 101 is overlaid on the circuit. Configure the circuit breaker.

(Internal configuration of circuit breaker)
The circuit breaker 1 is in the form of an earth leakage breaker. The circuit breaker 1 has a power supply side terminal (105a, 105b) provided on the power supply side and a load side terminal 104 provided on the load side (a load side terminal on the other pole). Is not shown), a main circuit conductive portion 111 of each pole connected to these terminals, a contact opening / closing mechanism portion 112 that contacts / separates contacts provided on the main circuit conductive portion 111 interposed in the main circuit conductive portion 111, When an abnormal current such as an overcurrent or a short-circuit current flows through the main circuit conductive portion 111, the heat having an inverse time characteristic that acts on the contact opening / closing mechanism in an operation time corresponding to the magnitude of these currents to turn off the circuit. Dynamic-electromagnetic trip device (113), zero-phase current transformer (ZCT) 109 through which the main circuit conductive portion 111 of each pole is inserted, and leakage current that flows through the circuit in response to an output signal from the ZCT 109 Detection circuit 1 for detecting the size of 0, an earth leakage interrupting mechanism (trip coil) 108 which receives an operation signal from the detection circuit 110 and acts on the contact switching mechanism 112 to turn off the circuit when the magnitude of the earth leakage current reaches a predetermined magnitude, etc. Is provided. Between each pole, the inter-electrode insulating wall A (107) is disposed, and the insulation of each pole is maintained.

Further, the contact opening / closing mechanism 112 is connected to the operation handle 103 by a link mechanism, and can be manually turned on / off from the outside of the body by the operation handle 103 in addition to the operation by the automatic shut-off mechanism.

A test button 106 for manually confirming the operation of the detection circuit 110 and the trip coil 108 from the outside of the body is provided on the front side of the body. A part of the test button 106 protrudes outside the body and can be pressed with a finger or the like from the outside of the body. A contact circuit connected to the detection circuit 110 is provided on the bottom side of the test button 106, and the detection circuit 110 is driven by closing the contact circuit when the test button 106 is pressed. .

In the circuit breaker 1, the electrodes are insulated from each other by the inter-electrode insulating wall A (107). The inter-electrode insulating wall A (107) is disposed in the body in a substantially flat shape in the longitudinal direction of the circuit breaker from the power source side terminal side 105 to the load side terminal 104 side to insulate the electrodes from each other. A printed circuit board constituting the detection circuit 110 is disposed on the side surface of the inter-electrode insulating wall A (107), and a test button holding unit 107A1 for holding the test button and a test button 106 are provided on the front side. A contact circuit arrangement portion connected to the detection circuit 110 provided on the bottom surface side is formed.

FIG. 2 shows a state in which the inter-electrode insulating wall A (107) and the detection circuit 110 are removed. The tripping device 113 is located on the back surface side of the inter-electrode insulating wall A (107) and is fitted and fixed to the arrangement portion 114 provided in the second case 102.

3 shows a side view of the tripping device 113, and FIG. 4 shows an exploded perspective view of the tripping device 113. As shown in FIG. The tripping device 113 is a thermal-electromagnetic type tripping device, which detects an overcurrent flowing through the main circuit conductive portion and detects a short circuit current flowing through the main circuit conductive portion by a bimetal thermal operation portion that operates in a delayed manner. It has a structure that also has an electromagnetic part with an electromagnet structure that detects and operates instantaneously.

The trip device 113 includes a main circuit conductive portion a (113a) having a fixed contact 111i disposed at one end, a main circuit conductive portion b (113b) connected to the other end of the main circuit conductive portion a (113a), A part of the main circuit conductive part is constituted by the main circuit conductive part j (113j) connected to the main circuit conductive part b (113b).

In the configuration of the thermal operation portion, the main circuit conductive portion b (113b) is configured using a bimetal. Joule heat is generated by the overcurrent flowing in the main circuit conductive portion, and the bimetal is heated by the Joule heat, so that the bimetal is bent and displaced, and acts on the contact opening / closing mechanism 112 to turn off the circuit.

The electromagnet structure that constitutes the electromagnetic part is arranged so as to face the main circuit conductive part b (113b) so as to surround the yoke 113 and the open end side of the yoke 113c and is attracted during operation. And a leaf spring 113e for maintaining a distance between the movable iron piece 113d and the yoke 113c in a normal state (a state in which no overcurrent or short-circuit current is generated). A magnetic field is generated around the main circuit conductive part b (113b) due to a short-circuit current flowing through the main circuit conductive part, and the movable iron piece 113d is fixed to the yoke 113c fixed by concentrating the magnetic field on the yoke 113c and the movable iron piece 113d. The suction is applied to the contact opening / closing mechanism to turn off the circuit.

The tripping device 113 includes the main circuit conductive portion a (113a), the main circuit conductive portion b (113b), the main circuit conductive portion j (113j), the yoke 113c, the movable iron piece 113d, the leaf spring 113e, and the like. It is fitted and fixed to the component arrangement part 114.

Specifically, one end of the main circuit conductive portion b (113b), one end of the main circuit conductive portion a (113a), and one end of the yoke 113c are integrally fixed by spot welding (spot mounting portion f ( 113f)). The main circuit conductive portion b is bent near the spot welded portion, and the main circuit conductive portion a and the main circuit conductive portion b extend in the same direction with a certain interval from the spot welded portion, The main circuit conductive portion connected from the power supply side to the load side is formed to have a portion facing substantially parallel to the main circuit conductive portion.

The yoke 113c is arranged so as to surround the main circuit conductive portion b (113b) with the open end directed toward the main circuit conductive portion a (113a) at a portion where the main circuit conductive portion faces substantially parallel. doing.

On the side of the main circuit conductive portion a (113a) inside the portion where the main circuit conductive portion is substantially parallel, the movable iron piece 113d is held by the leaf spring 113e and is substantially the same as the main circuit conductive portion a (113a). They are arranged in parallel, and are arranged with a certain interval facing the open end of the yoke 113c.

As shown in FIG. 4, the leaf spring 113e is formed in a substantially rectangular plate shape. At both ends in the longitudinal direction of the leaf spring 113e, a caulking portion g (113g) to be attached to the main circuit conductive portion a (113a) is formed on the bottom surface side, and the movable iron piece 113d is attached to the front side by caulking. A caulking portion h (113h) is formed. In the caulking portion, a hole portion into which the projection portion formed in the main circuit conductive portion a (113a) and the movable iron piece 113d is fitted is formed.

The leaf spring 113e is provided in the substantially parallel facing portion of the main circuit conductive portion a (113a), and is provided so as to overlap the movable iron piece 113d formed on the flat plate, as shown in FIG. In addition, the main circuit conductive portion a (113a), the leaf spring 113e, and the movable iron piece 113d are arranged substantially in parallel.

When the movable iron piece 113d is attracted to the yoke 113c, it is deflected and displaced in the direction of the yoke 113c with the caulking portion g (113g) as a fulcrum, but in the vicinity of the displaced portion, that is, the longitudinal central portion of the leaf spring 113e, The perforated part 113e1 is formed in an elongated shape in the extending direction in the longitudinal direction of the leaf spring.

In a leaf spring, the secondary moment of section changes due to changes in plate width and length in addition to plate thickness, and spring characteristics change. That is, the spring characteristics can be changed by changing the width and the length in the longitudinal direction of the perforated part 113e1.

When changing the characteristics of the leaf spring, the width and the length in the longitudinal direction of the perforated portion 113e1 of the leaf spring 113e formed in a substantially rectangular plate shape may be changed. In such a case, in the mold for processing the leaf spring 113e, the punched portion 113e1 of various sizes can be formed simply by changing the die piece for forming the punched portion 113e1 to a suitable size. Therefore, it is possible to configure a leaf spring with different spring characteristics while keeping the thickness and outer shape uniform.

The shape of the perforated part 113e1 may be formed by arranging a plurality of perforated parts having a similar shape in addition to the elongated shape. That is, the perforated portion in the displacement portion may be configured by continuously arranging a plurality of perforated portions formed in a substantially rectangular shape in the longitudinal direction of the leaf spring 113e. When changing the characteristics of the leaf spring, it is preferable to change the number of perforated portions to be continuously arranged or to change the size of the perforated portions. In addition to a substantially rectangular shape, a substantially circular perforated portion may be formed.

As described above, it is possible to provide an instantaneous trip device that has good workability of the leaf spring, can maintain stable mass production performance, and can be easily adjusted even when adjusting the performance of the electromagnetic trip device. .

DESCRIPTION OF SYMBOLS 1 Circuit breaker 102 2nd case 103 Operation handle 104 Load side terminal 105 Power supply side terminal 106 Test button 107 Interpole insulation wall 108 Trip coil 109 Zero phase current transformer (ZCT)
110 detection circuit 111 main circuit conductive part 111i fixed contact 112 contact opening / closing mechanism part 113 trip device 113a main circuit conductive part a
113b Main circuit conductive part b
113c Yoke 113d Movable iron piece 113e Leaf spring 113f Spot mounting part 113g Caulking part g
113h Caulking part h
113j Main circuit conductive part j
114 Placement section

Claims (3)

A yoke is arranged on one of the opposing conductors so as to surround the one conductor,
The other conductor, provided with a perforated portion to the displacement of the leaf spring which is formed in a plate substantially rectangular and arranged leaf springs that attaching the movable iron piece to the yoke facing one end portion of the leaf spring <br/> A structure for holding a movable iron piece in an instantaneous tripping device for a circuit breaker . 2. The holding structure for a movable iron piece in an instantaneous tripping device for a circuit breaker according to claim 1, wherein the movable iron piece is attached substantially parallel to the leaf spring. 3. The holding structure for a movable iron piece in an instantaneous tripping device for a circuit breaker according to claim 1, wherein the perforated part is formed in an elongated shape in the extending direction of the leaf spring.

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