JP4126869B2 - Circuit breaker accessory - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a voltage tripping device used in combination with a circuit breaker main body, an accessory device for a circuit breaker intended for an undervoltage tripping device, and more specifically, an electromagnet built in a unit case of the accessory device and its mounting structure About.
[0002]
[Prior art]
A voltage trip device that trips the circuit breaker with an external electrical signal, such as a circuit breaker for wiring, and an undervoltage that trips the circuit breaker when the main circuit voltage drops abnormally from the rated voltage A tripping device is known and its principle is shown in FIGS.
[0003]
5 and 6, 1 is a circuit breaker (wiring breaker) connected to the main circuit 2, 3 is a voltage trip device, 4 is an undervoltage trip device, and the trip devices 3 and 4. As shown below, the unit case has an electromagnet as an actuator and a trip lever that connects the electromagnet to the trip mechanism of the breaker body. The breaker body is tripped.
[0004]
Here, the voltage trip device 3 gives a trip command remotely via the external power source 5 and the switch 6, whereas the undervoltage trip device 4 takes in the interphase voltage of the main circuit 2. Thus, the breaker body 1 is tripped via the trip lever by the release operation of the electromagnet accompanying the voltage drop.
Next, the detailed structure of the conventional voltage tripping device 3 is shown in FIGS. 7 (a) to 7 (c). In the figure, 7 is a unit case (resin mold case), 8 is an external connection terminal, 9 is a fulcrum-shaped electromagnet, and 10 is a trip lever.
[0005]
Here, the electromagnet 9 includes an E-shaped (tripod structure) yoke 11 arranged with the contact surface facing upward, an armature 12 facing the contact surface of the yoke 11, and a coil bobbin (molded product) 13. And the armature 12 includes a pin 13b on an armature support portion (bearing) 13a formed integrally with the left end portion of the upper side flange portion of the coil bobbin 13. The solenoid coil 14 is connected to an external connection terminal 8 via a lead wire 17 and is connected to the external power source 5 shown in FIG. Has been. In addition, 11a is a shearing coil (claw coil) provided on the outer leg of the yoke 11, and 15 is a return spring (compression spring) that urges the armature 12 in the opening direction.
[0006]
On the other hand, the trip lever 10 extends in the vertical direction and is slidably guided to the unit case 7. The lower end of the trip lever 10 is connected to the tip of the armature 12 of the electromagnet 9 (the side opposite to the hinge portion). It faces the tripping plate 1a of the tripping mechanism that penetrates the unit case 7 and is incorporated in the circuit breaker body 1.
The assembly of the electromagnet 9 is positioned and supported on the unit case 7 as described below. That is, the coil bobbin 13 of the solenoid coil 14 is integrally formed with a pair of support arms 13c and 13d extending in the vertical direction, and the concave square holes formed in the support arms 13c and 13d are formed in the unit case 7. The coil bobbin 13 is fixed at a fixed position by fitting with a pair of upper and lower positioning support shafts 16 protruding inward from the side wall. The upper support arm 13c also serves as a stopper that restricts the opening position of the armature 12 by bending its tip into an L shape.
[0007]
With this configuration, the armature 12 of the electromagnet 9 is normally retracted to the open position by the spring force of the return spring 15, and the tripping lever 10 linked to the armature 12 is also pushed upward to trip the breaker body 1. It is detached from the plate 1a. From this state, when the switch 6 shown in FIG. 5 is turned on and the solenoid coil 14 is energized, the armature 12 is attracted against the return spring 15 by the electromagnetic force, and the trip lever 10 is interlocked with this movement. The tripping plate 1a is pushed down to the release position, whereby the breaker body 1 trips and opens the main circuit contact.
[0008]
Next, the conventional structure of the undervoltage trip device 4 is shown in FIG. This undervoltage trip device basically has a configuration in which the same components as those of the voltage trip device 3 described above are combined. A unit case 7 having the same structure as in FIG. 7 has a fulcrum type electromagnet 9 and a trip lever 10. Is incorporated.
However, the undervoltage trip device 4 always energizes the solenoid coil 14 of the electromagnet 9 at the rated voltage of the main circuit, and attracts the armature 12 by the electromagnetic force, contrary to the voltage trip device 3 described above. When the trip lever 10 is kept pushed up and the main circuit voltage drops abnormally and the electromagnetic force of the solenoid coil 14 decreases, the opening force of the armature 12 is interlocked with the opening force of the return spring 15. Then, in order to pull down the trip lever 10 and cause the breaker body to trip, the mounting posture of the electromagnet 9 is 180 ° up and down compared to the voltage trip device 3 shown in FIG. Inverted. That is, the yoke 11 of the electromagnet 9 has the armature surface facing downward, the armature 12 is disposed below the yoke 11, and the left end thereof is hinged to the armature support portion 13a formed on the lower surface side of the coil bobbin 13, and the right end Is connected to the lever 10.
[0009]
With this configuration, the armature 12 of the electromagnet 9 is normally attracted to the armature surface of the yoke 11 against the return spring 15 by excitation of the solenoid coil 14, and pushes the trip lever 10 upward. If the main circuit voltage drops abnormally in this state, the electromagnetic force of the electromagnet 9 decreases, the spring force of the return spring 15 overcomes and the armature 12 opens downward, and in conjunction with this, the trip lever Press 10 down. As a result, the tripping mechanism of the breaker body trips to open the main circuit contact.
[0010]
[Problems to be solved by the invention]
By the way, the voltage trip device 3 and the undervoltage trip device 4 having the conventional structure have the following problems to be solved. That is,
(1) As is apparent from a comparison between the voltage trip device 3 of FIG. 7 and the undervoltage trip device 4 of FIG. 8, the position of the armature support portion 13a formed on the coil bobbin 13 of the electromagnet 9 is the undervoltage trip device. The device 3 and the undervoltage trip device 4 are reversed. If the electromagnet 9 of the voltage trip device 3 shown in FIG. 7 is turned upside down as it is, the armature support 13a formed at the left end of the coil bobbin 13 will be positioned on the right side after the turnover. The trip lever 10 cannot be linked and cannot be employed in the undervoltage trip device 4.
[0011]
Therefore, conventionally, as the coil bobbin 13 of the electromagnet 9 equipped in the circuit breaker attachment device, two types of parts for the voltage trip device shown in FIG. 7 and the undervoltage trip device shown in FIG. 8 are used. However, the number of parts increases and the cost increases.
(2) In the assembled state in which the electromagnet 9 is mounted on the unit case 7, the fitting between the square holes formed in the support arms 13 c and 13 d of the coil bobbin 13 and the support shaft 16 provided on the case side is not even a little. If (clearance fitting) remains, when current (alternating current) is applied to the solenoid coil 14, chattering occurs between the armature 12 and the contact surface of the yoke 11, so that a roaring sound (noise) is generated. In addition, if the backlash of the support portion is large, the soldered portion of the lead wire 17 that connects between the terminal of the solenoid coil 14 and the external connection terminal 8 is broken by vibration generated when the electromagnet 9 is energized. There is a fear.
[0012]
Therefore, when the electromagnet 9 is mounted on the unit case 7, the coil bobbin 13 and the yoke 11 of the electromagnet 9 are stably fixed so as not to move from a fixed position, and vibration is not caused by AC excitation of the solenoid coil 14. It is hoped that
7 and 8, the armature attached to the coil bobbin 13 is based on the coil bobbin 13 that is supported by fitting the square holes of the support arms 13 c and 13 d to the support shaft 16 provided in the unit case 7. 12 and the coil bobbin 13 are positioned relative to the contact surface of the E-shaped yoke 11 with the center leg portion fitted.
[0013]
The present invention has been made in view of the above points. A first object of the present invention is to make it possible to share parts of an electromagnet applied to a voltage trip device and an undervoltage trip device, and a second object is simple. It is an object of the present invention to provide an attachment device for a circuit breaker having an improved support structure so that an electromagnet can be stably fixed at a fixed position in a unit case without looseness in a simple assembling operation.
[0014]
[Means for Solving the Problems]
According to the present invention, a voltage tripping device used in combination with a circuit breaker body, a circuit breaker accessory device for an undervoltage tripping device, an electromagnet in the unit case, and the operation of the electromagnet Equipped with a tripping lever that releases the tripping mechanism of the breaker body in conjunction with the above, where the electromagnet is E-shaped yoke, coil bobbin is wound around the coil, and the solenoid coil is inserted into the central leg of the yoke The armature has a structure in which one end of the armature is hinged to an armature support provided on the coil bobbin and the other end is pulled out and connected to a lever.
(1) In order to achieve the first object, two sets of armature support portions corresponding to the voltage tripping device and the undervoltage tripping device are distributed and symmetrically formed on the coil bobbin (claimed) Item 1).
[0015]
By adopting the coil bobbin with the above configuration, in the electromagnet used in the voltage trip device, the armature is attached using one of the two sets of armature support portions formed on the coil bobbin, and the other armature support portion is used in the undervoltage trip device. The armature can be hinged by using the coil bobbin, so that the coil bobbin can be applied to both the voltage tripping device and the undervoltage tripping device as a common part.
[0016]
(2) In order to achieve the second object, a support arm with a hole extending up and down from the coil bobbin is fitted to a positioning support shaft provided on the side wall of the unit case so as to be fixed in place. And, after forming a ridge that adds a margin to the peripheral surface of the support shaft, the support shaft is press-fitted into the hole of the support arm to fix the coil bobbin in place (Claim 2). Further, the shising coil provided on the outer leg portion of the yoke is used as a locking member, and the peripheral portion thereof is press-fitted onto the positioning support protrusion provided on the side wall of the unit case to lock and fix the yoke in a fixed position. 3).
[0017]
According to the above support structure, the support arm of the coil bobbin and the support shaft of the unit case are firmly coupled without play, and the armature and yoke of the electromagnet can be properly positioned with reference to this coil bobbin. In particular, the E-shaped yoke has its center leg pressed against the end face of the coil bobbin of the solenoid coil, and the periphery of the shising coil provided on the outer leg of the yoke is pushed into the inside of the support projection on the unit case side. Thus, the yoke can be supported at a fixed position without any backlash, thereby preventing the breakage of the lead joint caused by the electromagnet's roaring sound and the vibration of the yoke due to coil energization. In addition, according to this support structure, there is no possibility that the support member of the electromagnet interferes with the movement of the armature, and further, the assembly to the unit case does not use a set screw, so that the assembly work can be easily performed.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the examples shown in FIGS. FIG. 1 shows an example of application to a voltage tripping device, and FIG. 2 shows an application example to an undervoltage tripping device. In the drawing of the illustrated embodiment, members corresponding to FIGS. Detailed description is omitted.
[0019]
In the illustrated embodiment, an electromagnet 9 incorporated in the unit case 7 of the voltage trip device 3 shown in FIGS. 1 (a) and 1 (b) and an undervoltage trip device 4 shown in FIGS. 2 (a) and 2 (b). The electromagnet 9 incorporated in is constructed by using the same parts.
That is, two sets of armature support portions 13a-1 and 13a-2 are distributed to the left and right of the coil bobbin 13 of the electromagnet 9, and are integrally formed on the flange portion of the bobbin. When this electromagnet 9 is applied to the voltage tripping device 3, the armature 12 is hinged to the armature support 13a-1 formed on the left side of the coil bobbin 13 through the pin 13b as shown in FIG. The armature 12 is assembled to the unit case 7 with the yoke 11 facing downward, and the support arms 13c and 13d extending vertically from the coil bobbin 13 project inward from the side wall of the case 7 to the vertical position. It fixes to the spindle 16 for positioning.
[0020]
On the other hand, when the electromagnet 9 is applied to the undervoltage trip device 4 shown in FIG. 2, the yoke 11 and the armature 12 are reversed left and right from the position shown in FIG. 1 with respect to the coil bobbin 13, and the armature 12 is turned into the coil bobbin 13. The armature support portion 13a-2 thus formed is hinged through the pin 13b, and is turned upside down so that the armature 12 is at the bottom and the yoke 11 is at the top as shown in the figure. The support arm 13c extending and the support arm 13d extending upward are fixed to the upper and lower support shafts 16 provided in the unit case 7.
[0021]
In this manner, by arranging two sets of armature support portions 13a-1 and 13a-2 on the coil bobbin 13 in advance on the left and right sides and integrally forming them, the voltage tripping device 3 and the undervoltage tripping device using the coil bobbin 13 as a common component. 4 can be supported.
In the voltage trip device 3 and the undervoltage trip device 4 of the illustrated embodiment, the coil bobbin 13 and the yoke 11 are positioned at fixed positions and fixed without play with the electromagnet 9 mounted on the unit case 7. The following measures are taken.
[0022]
That is, FIG. 3 is a support structure diagram of the support arm 13c of the coil bobbin 13 and the support shaft 16 on the case side represented by the arrow AA in FIG. 1 (a). A shaft hole is formed in the peripheral surface 16 of the upper and lower, left and right four protrusions 16a for interference fitting, and the support shaft 16 is formed in the support arm 13c when the electromagnet 9 is assembled to the unit case 7. When fitting into the (square hole) 13e, the support shaft 16 is press-fitted into the shaft hole 13e so as to be an interference fit with the dimension a in the figure as a tightening margin. Further, the lower support arm 13d is also press-fitted into the support shaft as in FIG. Thereby, the coil bobbin 13 is fixed to a fixed position without backlash.
[0023]
On the other hand, the yoke 11 of the electromagnet 9 is positioned and fixed to a fixed position with respect to the coil bobbin 13 supported on the unit case 7 as described above. That is, a pair of upper and lower support protrusions 18 are formed on the inner wall surface of the unit case 7 so as to oppose the peripheral edge of the sizing coil 11 a provided on the outer leg portion of the E-shaped yoke 11.
[0024]
When the assembly of the electromagnet 9 is attached to the unit case 7, the support arms 13 c and 13 d of the coil bobbin 13 are fixed to the support shaft 16 on the case side, and then the center of the yoke 11 fitted and inserted into the coil bobbin 13. While pressing the base of the leg against the flange surface of the bobbin, the peripheral edge of the shimming coil 11a is press-fitted into the upper surface of the support protrusion 18 as shown in FIG. In this case, the size of the support protrusion 18 is set so that an upper surface is a circular arc surface and an interference b is provided between the support protrusion 18 and the sheathing coil 11a as illustrated. As a result, the yoke 11 can be positioned and fixed at a fixed position without play with the fitting insertion contact surface with the coil bobbin 13 and the pressure insertion contact surface between the above-described shizing coil 11a and the support protrusion 18 as supporting points.
[0025]
【The invention's effect】
As described above, according to the configuration of the present invention, the two sets of armature support portions corresponding to the voltage tripping device and the undervoltage tripping device are placed in the symmetrical position on the coil bobbin of the electromagnet incorporated in the accessory device. By distributing and integrally forming, this coil bobbin can be used as a common part for both voltage tripping devices and undervoltage tripping devices, and there is no need to prepare two types of coil bobbins as in the past, and parts management is easy. It becomes. In addition, by adopting the configuration of claims 2 and 3, the generation of vibration associated with the energization of the electromagnet is suppressed to reduce the humming noise, and the breakage of the lead joint portion of the solenoid coil of the electromagnet caused by the vibration can be prevented. Thus, it is possible to provide a circuit breaker accessory device having a high practical value.
[Brief description of the drawings]
1A and 1B are side views and a plan view, respectively, showing a structure of a main part of a voltage trip device according to the configuration of the present invention. FIG. 2 is an undervoltage according to the configuration of the present invention. It is a block diagram showing the principal part structure of a tripping device, (a), (b) is a side view and a plan view, respectively. FIG. 3 is a support arm and a case of a coil bobbin represented by arrows AA in FIG. It is a figure showing the attachment structure between the side support shafts, (a) is a cross-sectional view in side view, (b) is a cross-sectional view in the direction of arrows XX in FIG. FIG. 5 is a view showing a mounting structure between a squeezing coil and a support protrusion on the case side, in which (a) is a side view and (b) is a cross-sectional view taken along line YY in FIG. Fig. 6 is a schematic diagram of an undervoltage trip device. Fig. 7 is an assembly structure diagram of a conventional voltage trip device. (A) is a front view, (b) is a plan view, (c ) Is the front of the electromagnet part FIG. 8 is an assembly structure diagram of a conventional undervoltage trip device, where (a) is a front view and (b) is a front view of an electromagnet portion.
DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Main circuit 3 Voltage trip device 4 Undervoltage trip device 7 Unit case 9 Electromagnet 10 Trip lever 11 Yoke 11a Sheathing coil 12 Armature 13 Coil bobbin 13a-1, 13a-2 Armature support part 13c, 13d Support Arm 13e Shaft hole 14 Solenoid coil 15 Return spring 16 Spindle 16a Projection 18 Support protrusion

Claims (3)

Circuit breaker accessory device for voltage tripping device and undervoltage tripping device used in combination with circuit breaker body, in which the electromagnet in the unit case and the circuit breaker linked to the operation of the electromagnet Equipped with a tripping lever that releases the tripping mechanism of the main body, where the electromagnet consists of an E-shaped yoke, a coil coil wound around a coil bobbin, and a solenoid coil and armature inserted into the central leg of the yoke, And the armature has a structure in which one end is hinged to an armature support provided on the coil bobbin, and the other end is pulled out and connected to a lever.
An accessory device for a circuit breaker, wherein two sets of armature support portions corresponding to a voltage tripping device and an undervoltage tripping device are distributed and symmetrically formed on the coil bobbin. 2. The attachment device according to claim 1, wherein a support arm with a hole extending vertically from the coil bobbin is fitted to a positioning support shaft provided on a side wall of the unit case so as to be fixed at a fixed position, and An auxiliary device for a circuit breaker, characterized in that a convex strip for adding a fastening margin is formed on the peripheral surface, and then the support shaft is press-fitted into the hole of the support arm to fix the coil bobbin in place. 2. The accessory device according to claim 1, wherein the yoke is placed in a fixed position by pressing the peripheral portion of the sizing coil provided on the outer leg of the yoke onto the positioning support protrusion provided on the side wall of the unit case. A circuit breaker accessory device characterized in that it is locked and fixed to the circuit breaker.

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