JPH03127804A - Electromagnetic tripping device for circuit breaker - Google Patents

Abstract

PURPOSE:To easily remove a leakage iron piece by providing a cutout in the hole of the piece which is passed through an oil dash pot, and deforming the piece to increase the cutout. CONSTITUTION:A cutout 22 is formed at a hole 21 of a leakage iron piece 20 which is passed through an oil dash pot 2 of a leakage iron piece 20, and the width of the cutout 22 is smaller than the diameter of the hole 21. A notch 23 is provided forward from the hole 21, and a neck 24 is formed at the front edge of the piece 20. Such a piece 20 is associated with an electromagnetic tripping device in the same manner as a prior art. Thus, the piece 20 associated with the device can easily be removed. If only the device having the piece 20 is associated, the device having no piece 20 can simply be obtained to simplify assembling steps and inventory stock management.

Description

[Detailed description of the invention] [Industrial application field]

This invention includes an electromagnet with a one-bottle oil dash structure,
The present invention relates to an electromagnetic tripping device that attracts an armature to an electromagnet to trip a circuit breaker when an overcurrent passes through it, and more particularly relates to a structure incorporating a leakage iron piece provided for adjusting instantaneous tripping characteristics.

[Conventional technology]

3 and 4 show the conventional structure of this type of electromagnetic tripping device, with FIG. 3 being a plan view and FIG. 4 being a longitudinal sectional view thereof. In the figure, 1 is an L-shaped yoke, 2 is an oil dashpot fixed to one leg of the yoke 1 and has an armature 3 on its head, and 4 is a coil arranged surrounding the oil dashpot 2. , 5 is an armature swingably supported on the other leg of the yoke. The oil dashpot 2 has a structure in which a plunger 7 is housed together with silicone oil in a cylinder 6 made of a non-magnetic material, and a return spring 8 is inserted between the armature 3 and the plunger 7. The oil dash pot 2 is inserted into a burred hole in the yoke 1 and fixed to the yoke 1 by soldering. Upper insulation flange 1
1, the coil 4 and the lower insulating flange 12 are fitted in order to form the structure shown. The compression spring 9 serves to press and fix the leakage iron piece 10 and other parts fitted into the oil dashpot 2 against the yoke 1. One wire end 4a of the coil 4 is guided downward through a notch (not shown) in the yoke 1, and soldered to the connecting plate 13. Ah, 76. . Connection plate 130. . A lead wire is connected to a movable contact of a circuit breaker (not shown). The other wire end 4b of the coil 4 is soldered to a terminal plate 14 on the load side of the circuit breaker. Armature 5
is fitted into the notch at the upper end of the yoke 1, and the return spring 1
5, it is held in the illustrated state away from the armature 3. Here, when a current larger than the rated current flows through the coil 4, the attractive force against the plunger 7 based on the magnetic flux becomes larger than the spring force of the return spring 8, and the plunger 7 moves upward in the figure. When the plunger 7 reaches the armature 3, the resistance of the magnetic circuit passing through the armature 5 decreases, and the armature 5 is attracted to the armature 3 as shown by the two-dot chain line. This armature 5 hits a tripping mechanism (not shown) with its operating end 5a to trip the circuit breaker. At even higher currents, the armature 5 is moved by the plunger 7.
It is attracted to the armature 3 without waiting for the attraction of the circuit breaker 5, and the circuit breaker is instantly tripped. The leakage iron piece 10 bypasses the magnetic flux between the yoke l and the oil dashpot 2 when the circuit breaker trips, thereby improving the instantaneous tripping characteristic, and its shape is shown in FIG. 5. Here, FIG. 5(A) is a plan view,
Figure (B) is its side view. As shown in the diagram, leaking iron piece 1
0 is a thin iron plate having a circular shape at the front along the coil 4 and a rectangular shape at the rear along the yoke 1, with a hole 16 made in the center through which the oil dashpot 2 passes. This leakage iron piece 10 is fitted into the oil dashpot 1-2 next to the compression spring 9, prior to fixing the oil dashpot 2 to the yoke 1 as described above. FIG. 6 is a diagram qualitatively showing the instantaneous tripping characteristics of a circuit breaker, where the horizontal axis is the breaking current and the vertical axis is the time. leaking iron piece 1
0 is incorporated, the magnetic flux caused by the current leaks before the armature 5, so the leaking iron piece 10 as shown in the figure
The breaking current that trips the circuit breaker is greater than that without one. That is, depending on the presence or absence of the leaky iron piece 10, the tripping characteristics of the electromagnetic tripping device can be increased or decreased.

[Problem to be solved by the invention]

By the way, in the conventional electromagnetic tripping device described above, the hole 16 of the leaking iron piece 10 through which the oil dashpot 2 passes is closed, and once the leaking iron piece 10 is incorporated into the electromagnetic tripping device, it cannot be removed. Therefore, when trying to obtain two types of electromagnetic tripping devices, one with the leaky iron piece 10 incorporated and one without, the problem has to be made from the assembly stage, which complicates the assembly process and inventory management. was there. An object of the present invention is to provide an electromagnetic tripping device for a circuit breaker which solves the above-mentioned problem by making it possible to easily remove a leaky iron piece after it has been installed.

[Means to solve the problem]

In order to achieve the above object distantly, the present invention provides an oil dashpot having an armature on the head fixed to one leg of a single-shaped yoke, and a coil arranged around the oil dashpot. , an armature that is attracted to the armature is swingably supported on the other leg of the yoke, and a magnetic flux is transmitted between the armature and the coil between the yoke and the oil dashpot. In an electromagnetic tripping device of a circuit breaker, a leakage iron piece to be bypassed is inserted, and this leakage iron piece is pierced by the oil dashpot,
A notch is provided in the hole of the leaking iron piece through which the oil dashpot is passed,
By deforming the leaky iron piece and widening this notch, the leaky iron piece can be removed. =6-

[For use]

By deforming the leaking iron piece and widening the notch, the leaking iron piece incorporated into the electromagnetic tripping device can be easily removed. Therefore, by incorporating the leaky iron piece for the time being and removing it when it is desired to obtain a piece without leaking iron piece, there is no need to distinguish whether there is a leaking iron piece at the assembly stage.

【Example】

Hereinafter, the present invention will be explained in detail based on FIGS. 1 and 2. Here, FIG. 1 is a plan view showing how the leaking iron piece is removed, FIG. 2(B) is a plan view of the leaking iron piece in FIG. 1, and FIG. 2(B) is a side view thereof. Note that the same parts as those in the conventional example are denoted by the same reference numerals, and the explanation thereof will be omitted. First, in FIG. 2, a notch 22 is provided laterally in a hole 21 of the leaking iron piece 20 through which the oil dashpot 2 is passed. The width of the notch 22 is smaller than the diameter of the hole 21. Further, a notch 23 is provided forward from the hole 21, and a constricted portion 24 is formed at the front edge of the leaky iron piece 20. Such a leaky iron piece 20 is incorporated into an electromagnetic tripping device in the same manner as in the prior art. FIG. 1 is a plan view of an electromagnetic tripping device in which the leaky iron piece 20 is incorporated. Although there is a notch 22 in the hole 21 through which the oil dashpot 2 passes, the width of the notch 22 is smaller than the diameter of the oil dashpot 2, so the leaking iron piece 20 cannot be removed as it is. On the other hand, this leaking iron piece 20 is
It can be easily removed by deforming the constricted portion 24 in the direction shown by arrow A in FIG. 1 to widen the notch 22, and then pulling it out in the direction of arrow B. When the leakage iron piece 20 is removed, the magnetic flux does not leak and all acts as an attractive force of the armature, so that the instantaneous tripping characteristics of the electromagnetic tripping device deteriorates.

【Effect of the invention】

According to this invention, the leaky iron piece incorporated in the electromagnetic tripping device can be easily removed, so if only the electromagnetic tripping device with the leaking iron piece is assembled, it is possible to easily obtain one without the leaking iron piece. This simplifies the assembly process and inventory management.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention showing how the leaky iron piece is removed. 21Q (A,) is the planar view of the leaking iron piece in Fig. 1, Fig. 2 (B) is its side view, Fig. 3 is a front view of the conventional example, and Fig. 4 is its side view. Longitudinal cross-sectional view, Fig. 5 (A)
B) is a side view thereof, and FIG. 6 is a diagram illustrating changes in instantaneous tripping characteristics of the electromagnetic tripping device depending on the presence or absence of a leaky iron piece. ■...Yoke, 2...Oil dash pot, 3...
Armature, 4... Coil, 5... Armature, 20
...Leaking iron piece, 21...hole, 22...notch.

Claims (1)

[Claims] 1) An oil dashpot having an armature on the head is fixed to one leg of an L-shaped yoke, a coil is arranged surrounding this oil dashpot, and the armature is attached to the other leg of the L-shaped yoke. An armature that is attracted to the pole is swingably supported, and a leakage iron piece is inserted between the armature and the coil to bypass the magnetic flux between the yoke and the oil dash pot. In an electromagnetic tripping device for a circuit breaker penetrated by the oil dashpot, a notch is provided in the hole of the leakage iron piece through which the oil dashpot is passed, and the leakage iron piece is deformed to widen this notch. An electromagnetic tripping device for a circuit breaker, characterized in that the iron piece can be taken out.