JPS5821159Y2 - Trance - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in transformers.

Normally, a transformer, for example a power transformer, combines an E-type iron core and a ■-type iron core, and the central leg of the E-type iron core has a primary coil and a secondary coil.
It is constructed by arranging the following coils.

By the way, since a transformer is normally fixed to the chassis of an electrical equipment, the iron core is at ground potential, and if the electrical insulation between the iron core and the coil is not sufficient, it can cause an electric shock accident.

Coils using thick magnet wire are electrically insulated by inserting insulated paper between the coil and the iron core so that the coil itself maintains its shape.

However, the paper swells and becomes uneven, and does not fit perfectly to the shape of the coil, which not only hinders the work of inserting the iron core, but also makes it impossible to obtain a sufficient creepage distance.

For this reason, the gap between the coil and the iron core must be increased, which has the disadvantage of making the transformer less compact and less safe.

The present invention has been devised in view of the above points, and provides a transformer having a structure in which the coil and the iron core are insulated by an insulating member.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In Fig. 1, a rectangular shaped coil 1 is wound in perfect alignment using thick magnet wire, in other words, each layer is aligned in one row and wound closely, and each winding of an adjacent layer is wound in perfect alignment. The line is wound so that it occupies a precise position between the two lower windings.

The coil 1 is widely wound around a winding tool (not shown) having a square or rectangular cross section, and the primary coil and secondary coil are stacked on top of each other.

The opposing sides 2 and 3 of the coil 1 are made of synthetic resin, for example 6
It is covered with insulating frames 4 and 5 molded using 6 nylon or polycarbonate resin.

The insulating frames 4 and 5 are formed into a rectangular tube shape by combining two frames of the same shape.

The inner dimensions of the insulating frames 4 and 5 are set to be approximately the same as or slightly larger than the cross-sectional dimensions at the sides of the coil 1.

Further, the length of the insulating frame 4.5 is formed shorter than the distance between the other opposing sides 6 and 7 of the coil 1.

Flange walls 8, 9 are formed upright on the outer edges of the insulating frames 4, 5 to increase the creeping distance between the coil and the iron core.

The distance between the collar walls 8 and 9 is determined by the number of laminated iron cores.

Further, the distance between the insulating frames 4 and 5 is slightly larger than the width of the central leg of the inserted iron core.

Furthermore, dimensions 11 and 12 of the two sides of the insulating frames 4 and 5 are slightly smaller than the dimensions of the space surrounded by the E-shaped iron core and the ■-shaped iron core.

Therefore, when an iron core (not shown) is inserted into the coil 1, no extra space is created.

As shown in FIG. 2, the frame bodies 10 constituting the insulating frames 4 and 5 are provided with step edges 11 and 12 that overlap each other at the joint portion, so that no gap is created when the pair of frames 10 are assembled. It becomes.

That is, the step edge 11.12 is made to be approximately equal to the thickness of the overlapping sides, and the length of the side including the step edge 11.12 is equal to the length of the side including the joining portion of the insulating frames 4 and 5. It is larger than the dimension 12.

The coil 1 equipped with the insulating frames 4 and 5 is further provided with four insulating plates 13, 14, 15° 16 made of the same synthetic resin as described above.
Install.

The insulating plates are a set of two, and the other side 6 of the coil 1
, 7 and the flange walls 8, 9 of the insulating frames 4, 5 from both sides of the coil.

The insulating plates 13, 14, 15, 16 are formed in the same shape and are provided with mutually overlapping end edges 17 at the insertion tips.

The thickness of the edge portion 17 is approximately the same as the other thicknesses. The portion of the insulating plate exposed outside the coil is approximately the same height as the collar walls 8 and 9, increasing the creepage distance between the iron core and the side portion of the coil 1.

The insulating plate is also provided with hook portions 18, 19 extending on both sides to prevent the insulating plate from being inserted excessively.

In Fig. 1, the joining part of the insulating frames 4 and 5 is provided on the side in the insertion direction of the iron core, but this is done by reducing the wall thickness of the side of the insulating frame that does not have the joining part to increase the width of the iron core. makes it possible to expand the
It also prevents the insulating frame from preventing the insertion of the E-type iron core.

However, if the above-mentioned matters can be tolerated, the position of the joint portion is not limited.

Furthermore, in the above embodiments, the insulating frame was constructed by combining frames of the same shape, but it may also be constructed by fitting frames with irregularly shaped joints into each other, as shown in Fig. 3. Needless to say.

Furthermore, although the example in which two insulating plates are used as a set has been described, this may be in the form of a single plate.

In this case, the length of the insulating plate is preferably the same as the length of the flange wall in the direction of insertion of the dowel.

Further, the hook portion may be provided only at one end of the insulating plate, or may not be provided at all.

This insulating plate can be made of any insulating material, and may be in the form of a sheet if a sufficient creepage distance can be obtained.

As mentioned above, in this invention, the coil is separated from the iron core by an insulating frame with a flange wall and an insulating plate, so the creepage distance between the coil and the iron core is increased, no electric leakage occurs, and the synthetic resin The insulating frame was created by molding, improving dimensional accuracy.
No extra air gap is required between the coil and the iron core, allowing the transformer to be made smaller.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the transformer excluding the iron core, FIG. 2 is a perspective view of a frame constituting an insulating frame, and FIG. 3 is a perspective view showing another embodiment of the frame. In the figure, 1 is the coil, 2, 3, 6.7 are the sides of the coil, 4
, 5 is an insulating frame, 8 and 9 are flange walls, 10 is a frame body, 11.12
13.14, 15.16 are insulating plates, 17 is an edge portion, and 18.19 is a hook portion.

Claims (1)

[Scope of utility model registration request] A self-supporting coil wound in an array in a rectangular shape, a cylindrical insulating frame having a flange wall at both ends that covers each of the opposite sides of the coil, and each of the remaining opposite sides of the coil. and an insulating plate interposed between the insulating frame and the flange wall, and an EI type iron core that is attached to the coil by inserting a central leg into a space surrounded by the insulating frame and the insulating plate, and the insulating frame has two 1. A transformer characterized in that the transformer is formed by combining individual frame bodies, and a joint portion of the frame bodies has a multilayer structure.