JP2524252Y2 - Core for circuit breaker input coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit breaker, particularly to a core structure of a closing coil.

[Conventional technology]

Generally, machining takes a long processing time in the process, which leads to an increase in cost. On the other hand, sheet metal processing is suitable for mass production because the processing time for press punching, shearing, bending, and the like is all short, and the cost is lower than that for mechanical processing.

Based on these facts, recently, medium thickness 4.5 to 6
For processing to the mm level, a high-precision NC turret puncher is used. However, the closing coil of the circuit breaker has various problems, both of which are used.

The core of the closing coil of the circuit breaker has a large thickness because of its large coil capacity, which is shown in FIG. 4 to FIG. FIG. 4 is a perspective view showing an example of a closing coil core of a circuit breaker, FIG. 5 is a cross-sectional view in which a closing coil is mounted on the core of FIG. 4, and FIG. 6 shows two examples of a closing coil core of the circuit breaker. FIG. 7 is a perspective view showing three examples of the core of the closing coil of the circuit breaker, and FIG. 8 is a sectional view of the core of FIG.

FIG. 4 shows a box-shaped iron core 11 made of a casting and machined and finished with a plate thickness d. An upper hole 11a for a fixed iron core is provided, and a lower one for a movable iron core. Hole 11b is provided. In this, the coil 12 is accommodated as shown in FIG. 5, and the coil 12 is fixed at the center thereof by a fixed iron core 14 fixed with bolts 13 so as not to fly out, and the movable iron core 15 is inserted. Thus, a closing coil portion is formed.

When replacing the coil 12, the bolt 13 is loosened, the fixed iron core 14 and the movable iron core 15 are pulled out, and the coil 12 is pulled out toward the user.

In FIG. 6, two L-shaped brackets 16a having a plate thickness d of about 9 to 12 mm and bent into an L-shape are box-shaped and welded by meat 16b. Thereafter, machining is performed to form the iron core 16.

FIGS. 7 and 8 show that a round steel material 17a having a thickness d is cut to a predetermined length, machine-finished, and lids 17b and 17c are vertically arranged.
Are fastened with bolts 18 to form the iron core 17.

[Problems to be solved by the invention]

However, the iron cores 11, 16, 17 having such a structure have the following disadvantages.

1) Cast iron has a rough surface and cannot be used as iron core 11 unless machined. In addition, L
When the iron core 16 is formed by bending in the shape of a letter, the welded portion must be mechanically finished. Further, the iron core 17 made by cutting the round steel material 17a has to be machine-finished such as a cut portion of the steel material.

2) In the case of box-shaped cores 11 and 16, when replacing coil 12, core 1
The fixed cores 14 and the movable cores 15 had to be removed each time the replacement was performed because the units 1 and 16 were integral.

3) When the iron core 17 was a cylinder, the processing and finishing of the lid were difficult.

The present invention has been made in view of the above points, and the purpose thereof is to eliminate the need for mechanical finishing,
It is an object of the present invention to provide a breaker closing coil in which the coil can be easily replaced and which is inexpensive.

[Means for solving the problem]

In other words, means for achieving the object include a first U-shaped body formed by bending a thick plate capable of sheet metal processing into a U-shape, and a first U-shaped body formed by bending a thick plate capable of sheet metal processing. Different from the bending depth of the font
A second U-shaped body formed so as to be in close contact with the U-shaped body;
For the first U-shaped body formed to be able to abut against each other in accordance with the bending depth of the U-shaped body and the second U-shaped body, a third U-shaped body, and a second U-shaped body And a fourth U-shaped body.

Then, the outer frame formed by the first U-shaped body and the third U-shaped body and the inner frame formed by the second U-shaped body and the fourth U-shaped body are brought into close contact and integrated to form a double frame. It has a structure, and the bent steps are fastened with bolts or the like. In addition, the frame which is not bolted is fixed to the inner frame by a bolt which is fastened together with a fixed iron core which will be described later when the fixed iron core is attached.

[Action]

 The operation will be described together with the following embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

〔Example〕

FIG. 1 is a perspective view of an iron core showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of the assembled state of the closing coil, and FIG. 3 is a state diagram of the coil when the coil is replaced.

In FIGS. 1 and 2, a first U-shaped body 2b formed by bending a thick plate capable of sheet metal processing into a U-shape and a bending of the first U-shaped body 2b by bending a thick plate capable of sheet metal processing. The second U-shaped body 1b, which is different from the depth and is formed so as to be in close contact with the first U-shaped body 2b, abuts against each other in accordance with the bending depth of the first U-shaped body 2b and the second U-shaped body 1b. For the first U-shaped body 2b formed so that
For the second U-shaped body 2a and the second U-shaped body 1b, the fourth U-shaped body 1a
It is provided with.

Then, the outer frame formed by the first U-shaped body 2b and the third U-shaped body 2a and the inner frame formed by the second U-shaped body 1b and the fourth U-shaped body 1a are brought into close contact with each other and integrated. It has a double frame structure, and the bent steps are fastened with bolts or the like. In addition, the frame which is not fastened by bolts is fixed to the inner frame by bolts 5 which are fastened together with a fixed iron core to be described later when the fixed iron core is attached.

That is, the thick plates are bent to form the box-shaped cores 1 and 2 with one side of the double structure opened. The iron core 1 includes a first U-shaped body 2b and a third U-shaped body 2a, and the iron core 2 includes a second U-shaped body 1b and a fourth U-shaped body 1a.

The box-shaped iron cores 1 and 2 are formed by bending four thick plates so as to shift the positions of the inner joint A and the outer joint B.

In order to obtain such iron cores 1 and 2, the ends of the thick plate are bent, and first, the second U-shaped body 1b corresponding to the inner side is bent.
And a fourth U-shaped body 1a, and these are butted together to form a box-shaped iron core 1. When making this outer iron core 2,
The joint B is not located at the same position as the joint A of the inner iron core 1 but at a distance l slightly away from this. Although the outer third U-shaped body 2a is fastened to the second U-shaped body 1b with bolts 3, the respective cores are bolted to fasten the first U-shaped body 2b to the fourth U-shaped body 1a. May form.

In addition, holes 1c and 2c for the movable core
And holes 1d and 2 for mounting the closing coil A to the circuit breaker.
d is drilled.

Thus, when assembling the closing coil A of the circuit breaker using the iron cores 1 and 2 formed in this way, first, the fixed iron core 4 is fastened to the U-shaped bodies 1b and 2b by fastening the bolts 5 or the like. Then, the movable iron core 6 is inserted into the holes 1c and 2c of the U-shaped bodies 1a and 2a, and the coil 7 is mounted from above. Then, from above, the U-shaped bodies 1b and 2b on the fixed core side and the fixed core 4
And fasten with bolts 3.

 Next, the operation will be described.

Since the seam A of the iron core 1 and the seam B of the iron core 2 only have a cross section corresponding to the thickness of the iron plate more than other portions, in order to compensate for this, the distance l between the seam A and the seam B is set, and the U-shaped body 1b Are firmly fixed by bolts 3 so that the outer surface of the U-shaped body 2a is in surface contact with the inner surface of the U-shaped body 2a, thereby eliminating magnetic resistance. Note that, instead of this, there is also a method of attaching a flange and tightening with a bolt, but this is not preferable because the flange is protruded and the entire input coil becomes large.

In addition, when replacing the coil 7 or performing maintenance and inspection on the coil A thus obtained, loosen the bolt 3 and remove the coil 7 from the upper part except for the U-shaped bodies 1b and 2b as shown in FIG. Remove from

[Effects of the Invention] As described above, according to the present invention, the box-shaped cores 1 and 2 are bent by bending the thick plate to have a double structure, and displacing the positions of the inner joint A and the outer joint B. The formation makes it easy for the magnetic flux to pass through the overlapping surface of the shifted portion of the seam. As a result, the conventional machining of the iron core is eliminated, and the coil 7 can be easily removed from the circuit breaker at the time of maintenance and inspection and when replacing the coil, and the production cost of the input coil A is reduced. These are extremely practical.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the assembled state of the closing coil, FIG. 3 is a state diagram when the coil is replaced, and FIG. 4 is a conventional core of the closing coil. FIG. 5 is a cross-sectional view of the iron core of FIG. 4 with a make-up coil mounted thereon, FIG. 6 is a perspective view showing two examples of the make-up coil core, and FIG. Perspective view showing three examples,
FIG. 8 is a sectional view in which a coil is mounted on the iron core of FIG. 1,2,11,16,17 …… iron core, 3,5,13,18 …… bolt, 4,14…
… Fixed iron core, 6,15 …… Movable iron core, 7,12 …… Coil, 1a…
... A fourth U-shaped body, 1b... A second U-shaped body, 2a... A third U-shaped body, 2b.

Claims (1)

(57) [Scope of request for utility model registration] A first U-shaped body formed by bending a thick plate capable of sheet metal processing into a U-shape, and a bending depth of the first U-shaped body formed by bending a thick plate capable of sheet metal processing, Further, a second U-shaped body formed so as to be in close contact with the first U-shaped body and a first U-shaped body formed so as to be able to abut against each other in accordance with the bending depth of the first U-shaped body and the second U-shaped body. A third U-shaped body is provided for the U-shaped body, a fourth U-shaped body is provided for the second U-shaped body, and the first U-shaped body and the third U-shaped body are provided.
The outer frame formed by the U-shaped body, the second U-shaped body, and the fourth
A core for a circuit breaker input coil, wherein an inner frame formed by a U-shaped body is integrated into a double frame structure, and a bent step portion is fastened with bolts or the like.