JPH0733351Y2 - Electromagnetic trip device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of an electromagnetic trip device mainly applied to a circuit breaker for electric power and the like.

[Conventional technology]

Generally, an apparatus of this kind is known as shown in FIG. 6 (Japanese Patent Publication No. 60-46505). FIG. 6 is a schematic sectional view of a conventional device, and 31 in the drawing shows a fixed iron core.
The fixed iron core 31 is formed in a rectangular ring shape in a plan view, and a bearing portion 31c is formed to extend from the central portion of the one side portion 31a toward the other side portion 31d side opposite to the intermediate portion thereof, and A hole 31e having a diameter slightly larger than that of the bearing portion 31c is formed in the center of the other side portion 31d, and one end of the movable iron core 33 is inserted into the hole 31e.

The movable iron core 33 is formed in a cylindrical shape having a diameter slightly smaller than the diameter of the hole 31e, and one end of a non-magnetic operating rod 34 is concentrically connected to the other end.

The operating rod 34 has a coil spring 33c externally fitted to the movable rod 33.
And the bearing part 31c, the other side part 31d of the fixed iron core 31 is interposed.
Side of the fixed core 31 with the other end being biased toward
The movable iron core 33, which is rotatably pivotally fitted to the bearing portion 31c in a state of protruding outward from 31a and facing the latch 37,
A coil 35 is arranged around the operation rod 34 and the bearing portion 31c so as to be located in the inner region of the fixed iron core 31. 31f is a retainer made of a non-magnetic material for preventing slipping out.

In such an electromagnetic trip device, when the coil 35 is energized, the fixed iron core 31 and the movable iron core 33 are magnetized, and the electromagnetic force generated between the iron cores 31 and 33 causes the movable iron core 33 to be a coil spring. The operation rod 34, which is moved in the direction of the arrow against the 33c and is integrally connected thereto, presses one end of the latch 37, and the tripping operation is performed by the operation of the latch 37.

[Problems to be solved by the invention]

By the way, in this kind of device, various attempts have been made to speed up the operation, but the main countermeasure is to reduce the weight of the movable part. However, in the conventional device as described above, the weight reduction of the movable iron core 33, which is a movable part, directly leads to a decrease in the magnetic path cross-sectional area, which leads to an increase in the magnetic resistance, that is, a decrease in the magnetic force. There is a limit to the speeding up of the operation because the effect of speeding up due to the weight reduction is offset.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic trip device in which the weight of a movable part can be reduced without increasing the magnetic resistance and the operation speed can be increased. There is.

[Means for solving problems]

The device of the present invention comprises a ring-shaped first fixed iron core having an open portion, and an open portion of the first fixed iron core rotatably arranged in the open portion of the first fixed iron core when magnetized. A movable iron core that is rotated to form a closed magnetic circuit and is tripped, and a hollow shaft is provided on the movable iron core so that the shaft faces the open part of the first fixed iron core. A coil for externally fitting and pivoting the shaft formed by the second fixed iron core fixed to the first and second fixed iron cores and the movable iron core is provided.

[Action]

In the present invention, this makes it possible to reduce the weight of the movable part without increasing the magnetic resistance.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings showing an embodiment thereof.

FIG. 1 is a schematic front view showing a partial cross section of an electromagnetic trip device according to the present invention (hereinafter referred to as the device of the present invention), FIG. 2 is a right side view of FIG. 1, and FIG. 3 is FIG. 3 is a schematic plan view taken along the line III-III, in which 1 is a first fixed iron core, 2 is a second fixed iron core also serving as an axis, 3 is a movable iron core also serving as an actuating body, and 5 is a coil.

The first fixed core 1 has side portions 1b and 1c extending in parallel from one corner on a diagonal line on one surface of the plate-shaped base portion 1a, and extends from each terminal toward the center line side of the base portion 1a. The projections 1d, 1d that are present and have the end faces opposed to each other with a required dimension therebetween are provided to form a rectangular ring shape in which a part thereof is opened in plan view as a whole.

A support plate 6 made of a non-magnetic material having substantially the same shape facing the base portion 1a is screwed to the outer surfaces of the protrusions 1d, 1d so as to extend over the protrusions 1d, 1d. A second fixed iron core 2 extending to the base portion 1a side is fixed between the projecting portions 1d, 1d, and a movable iron core 3 is provided around the second fixed iron core 2 as an axis.
Is rotatably fitted on the outside.

The second fixed iron core 2 is formed as a rod having a circular cross section, one end of which is fixed to the support plate 6 at a right angle with the set screw 2a, and the other end of which is formed in a hole 1f formed in the center of the base portion 1a. It has been inserted. On the other hand, the movable iron core 3 is provided with a cylindrical portion 3a which constitutes a hollow shaft to be fitted onto the second fixed iron core 2 at the center thereof, and the movable iron core 3 is magnetized by projecting outward from the corresponding position of the peripheral wall at one end thereof. At this time, a pair of projecting pieces 3b, 3b forming two magnetic poles are formed, and both projecting pieces 3b, 3b are located in the open part 1h between the projecting parts 1d, 1d of the first fixed iron core 1. In this state, it is rotatably fitted onto the second fixed iron core 2, and the other end is axially supported by the slide bearing 1g in the hole 1f of the base portion 1a. A coil 5 is provided around the inside of the first fixed iron core 1. The end of the other end of the cylindrical portion 3a is projected to the outside of the base portion 1a of the first fixed iron core 1 through the hole 1f, and the end of the protruding cylindrical portion 3a of the movable iron core 3 is made of a non-magnetic material. A bearing 7a of a latch 7 connected to a trigger mechanism (not shown) is fitted and connected by a spring 7b.

In addition, the movable iron core 3 has a coil spring 3c on the outer periphery of its cylindrical portion 3a.
Is externally fitted, and the two protruding pieces 3b, 3b are always urged and held in a direction away from the both protruding portions 1d, 1d.

Thus, in such a configuration, when the coil 5 is energized, a magnetic circuit is formed in such a manner that the movable iron core 3, the first fixed iron core 1 and the second fixed iron core 2 are connected, and the projecting piece of the movable iron core 3 is formed. 3b, 3b
Electromagnetic force is generated between the first fixed iron core 1 and the protrusions 1d, 1d of the first fixed iron core 1, the movable iron core 3 receives a torque around the second fixed iron core 2, and resists the biasing force of the coil spring 3c. It can be rotated in the direction. When the movable iron core 3 rotates, the latch 7 linked with this by the spring pin 7b is also rotated,
The trip operation will be performed.

When the power supply to the coil 5 is cut off, the protrusion of the first fixed iron core 1
The electromagnetic force acting between 1d, 1d and the projecting pieces 3b, 3b of the movable iron core 3 disappears, and the protrusions 1d, 1d are generated by the biasing force of the coil spring 3c.
And the protrusions 3b, 3b are separated from each other, and the old position is restored.

Since the movable iron core 3 has its shaft portion formed in a hollow cylindrical shape and the second fixed iron core 2 is interposed inside, the weight of the movable iron core 3 can be significantly reduced, and the magnetic resistance is increased by the existence of the second fixed iron core 2. It is possible to speed up the operation without increasing the

FIG. 4 is a schematic front view showing another embodiment of the present invention, FIG.
The figure is also a left side view, and 21 indicates a first fixed iron core.

The first fixed iron core 21 extends from both ends of the base portion 21a to the side portion 21b.
And a side portion 21c slightly longer than this extending in parallel in the same direction, and the protrusion 21d in a state in which the side portions 21b, 21c are displaced from the tips of the side portions 21b, 21c toward the opposite sides. ,
21d is projected in a required size, and is formed in a rectangular ring shape in which a part is opened in plan view as a whole.
A coil 25 is attached to the. Both protrusions 21d,
21d is in a state of being displaced from each other by an amount corresponding to the difference in length between the side portions 21b, 21b. Both sides 21b, 21
A support plate 26 in the shape of a rectangular plate made of a non-magnetic material is fixed to the side surface on the same side in a manner connecting both side portions 21b, 21c, and an open portion 21h between the protrusions 21d, 21d. A second fixed iron core 22 is fixed at a position facing each other in such a manner as to project into the open portion 21h, and a movable iron core 23 is rotatably fitted on the second fixed iron core 22 with a slide bearing interposed. There is.

The second fixed iron core 22 is formed in a small-diameter cylindrical shape, and one end thereof is fixed to the support plate 26 by a set screw 22a in a direction orthogonal to this, and the other end of the first fixed iron core 21 is fixed. Projection 21
The opening 21h between the d and 21d is projected and positioned so as to cross the opening 21h.

On the other hand, the movable iron core 23 is formed by projecting a pair of projecting pieces 23b, 23b on the outer circumference of one end of the cylindrical part 23a at positions corresponding to each other in the circumferential direction, and these projecting pieces 23b, 23b are formed by the open part 21h. In addition, the end portion of the cylindrical portion 23a is projected through the opening portion 21h to the side opposite to the mounting position of the support plate 26 toward the side of the second fixed iron core 21 for a required length, and the latch portion 27 is provided at this end portion.
The shaft 27a is inserted and connected by spring pins 27b.

A coil spring 23c is pivotally fitted in the cylindrical portion 23a, one end of which is the cylindrical portion 23a itself and the other end of which is the first portion.
A direction in which the movable iron core 23 is pinned to the protrusion 21d of the fixed iron core 21 and the movable iron core 23 has its protrusions 23b, 23b separated from the protrusions 21d, 21d of the second fixed iron core 21 (opposite arrow shown in FIG. 4). It is biased to rotate.

Thus, in such an embodiment, when the coil 25 is energized, a magnetic circuit is formed in the movable iron core 23, the first fixed iron core 21, and the second fixed iron core 22, and the protrusions of the first fixed iron core 21 are formed. Electromagnetic force is generated between 21d, 21d and the projecting pieces 23b, 23b of the movable iron core 23, and the movable iron core 23 is rotated in the arrow direction against the biasing force of the coil spring 23c. As a result, the latch 27 is also rotated in the same direction, and the breaker or the like is tripped.

When the power supply to the coil 25 is cut off, the protrusion of the first fixed iron core 21
The electromagnetic force acting between 21d, 21d and the projecting pieces 23b, 23b of the movable iron core 23 disappears, and the projecting portion 2 is generated by the biasing force of the coil spring 23c.
1d, 21d and protrusions 23b, 23b are separated from each other, and the former position is restored.

In each of the above-described embodiments, coil springs 3c and 23c are provided in order to secure a gap between the projection 1d and the projection piece 3b, and the projection 21d and the projection piece 23b so that they can be repeatedly operated. Although the configuration is shown, if there is a restoring force in a motion transmission device (not shown) after the latches 7 and 27, the coil springs 3c and 2 are attached to the movable iron cores 3 and 23.
Of course, it is not necessary to provide 3c.

[Effect of device]

As described above, in the device of the present invention, the movable iron core is provided with the hollow shaft, and the shaft is externally fitted and pivotally supported on the shaft formed by the second fixed iron core fixed to the open portion of the first fixed iron core. Therefore, the present invention is excellent in that the circuit breaker can be tripped by the rotating operation of the movable core, and the movable core itself can be significantly reduced in weight, enabling high-speed operation without increasing magnetic resistance. It is effective.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the device of the present invention in a partial cross section,
2 is a right side view of FIG. 1, and FIG. 3 is III-III of FIG.
FIG. 4 is a schematic front view showing another embodiment of the present invention, FIG. 5 is a left side view of FIG. 4, and FIG. 6 is a partial sectional view of a conventional device. It is a schematic front view. 1 ... 1st fixed iron core, 1d ... projection, 1h ... open part, 2 ...
… Second fixed iron core, 3 …… Movable iron core, 3a …… Cylinder part, 3b…
… Protrusions, 5 …… Coil, 6 …… Support plate, 7 …… Latch,
21 …… First fixed iron core, 21d …… Projection part, 21h …… Open part, 22
…… Second fixed iron core, 23 …… Movable iron core, 23a …… Cylinder part 23b …… Projection piece, 25 …… Coil, 26 …… Support plate, 27 …… Latch In the figures, the same reference numerals are the same, or A considerable part is shown.

Claims (1)

[Scope of utility model registration request] 1. A first fixed iron core, which is formed in a ring shape and has an opening in a part thereof, and is rotatably arranged in the open portion of the first fixed iron core, and the first fixed iron core is opened when magnetized. In an electromagnetic trip device having a movable iron core that is rotated to form a magnetic circuit with a closed portion, the movable iron core is provided with a hollow shaft, and the shaft is provided with the first fixed iron core. A coil for magnetizing the first and second fixed iron cores and the movable iron core by externally fitting and pivoting the shaft formed by the second fixed iron core fixed thereto so as to face the open portion of the electromagnetic induction. Removal device.