JPH02891Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application and purpose of the invention) The present invention relates to the structure of a coil, specifically a bobbinless coil used in a transformer for a microwave oven, etc., and its purpose is to assemble a transformer. In this process, we have made it possible to accurately position the product with the iron core to provide a product with no backlash and excellent strength.In addition, we have provided terminal fittings for connecting the lead wires to improve the workability of connection work. The object of the present invention is to provide a coil that can be improved.

(Structure of the invention) The invention will be explained below with reference to the drawings. FIG. 1 shows the overall structure of the present invention. In the figure, 1 is a coil body, which is used, for example, as a primary coil of a transformer for a microwave oven. The present invention is characterized by a positioning insulating paper (hereinafter simply referred to as insulating paper for convenience) 2 attached to the coil body 1.

That is, as shown in FIG. 2, this insulating paper 2 is formed symmetrically in the unfolded state, with a substantially T-shaped cutting line 2a at the center, a cutting line 2b near the left and right upper ends, and furthermore in the vertical direction. A pair of winding pieces 2d, 2e, terminal covering pieces 2f, 2g, and a connecting piece 2 at the upper center are formed by a plurality of folding lines 2c.
It is divided into h. In addition, the left and right winding pieces 2
Positioning protrusions 2i are protruded from the upper and lower ends of each of the edges d and 2e, and the length l between the positioning protrusions 2i arranged in the vertical direction is as follows:
It is set equal to the stacking thickness of the central leg of the iron core incorporated in the present invention. Further, near both ends of the connecting piece 2h, there are terminal fittings 2 for connecting the lead wire of the coil body 1.
j is attached by bending its claw portion 2j' on the inner surface of the connecting piece 2h.

When attaching this insulating paper 2 to the coil body 1, as shown in FIG. 3 where the coil body 1 is omitted, a pair of terminal covering pieces 2f and 2g are folded inward to cover the claw portion 2j'. Rear, left and right wrapping pieces 2
d and 2e are bent so as to be wrapped around the coil side portion 1a (see FIG. 1). Thereafter, as shown in FIG.
Then, fix the coil body 1 and the connecting piece 2h, etc., and connect the lead wire 1 of the coil body 1 to the terminal fitting 2j.
b. This results in
The positioning protrusions 2i at both ends of the opposing inner surfaces of the pair of winding pieces 2d, 2e are provided to protrude inward, and these four positioning protrusions 2i and the winding pieces 2d, 2e The window portion 2k surrounded by the inner surface is formed in a size such that a center leg 13a of an E-shaped core 13, which will be described later, can fit therein.

To assemble a microwave oven transformer or the like using the present invention, as shown in FIG. , this central leg 13a is connected to a pair of shunt cores 14
Insert into the window 2k of the present invention arranged through the
After that, the I-type iron core 15 may be fixed. Note that, in order to insulate between the terminal fitting 2j and the iron core, it is preferable to use another insulating paper 16 at the exposed base end portion of the terminal fitting 2j.

FIG. 5 shows the positional relationship between the central leg 13a of the E-shaped core 13 in the thus assembled transformer and the present invention. length l
is made equal to the stacking thickness of the central leg 13a, so that accurate positioning can be performed without relative displacement between the coil and the E-type iron core 13. Incidentally, in FIG. 5, illustration of incidental members such as the tape 3 is omitted for convenience.

Further, the shape, structure, etc. of the insulating paper 2 are not limited to the above-mentioned embodiments, and the positioning protrusion 2
As long as the terminals i are formed at predetermined intervals and the terminal fittings 2j are attached at predetermined positions, the design can be freely changed.

(Effects of the invention) As described above, the invention includes a positioning insulating paper made of a single sheet of paper and a coil body into which this insulating paper is incorporated, and the insulating paper is symmetrical in the unfolded state. formed in
A pair of winding pieces and a pair of terminal coverings are formed by a nearly T-shaped cutting line formed in the center, cutting lines formed near the upper left and right ends, and a plurality of folding lines formed in the vertical direction. and a connecting piece at the upper center, and positioning protrusions are provided on the upper and lower ends of each end edge of each of the left and right winding pieces, and each of the positioning protrusions arranged in the vertical direction The lengths between the two are set to be equal to the stacking thickness of the central leg of the core to be incorporated, and furthermore, terminal fittings for connecting the lead wire of the coil body are installed near both ends of the connecting piece, and Positioning protrusions are disposed inwardly at both ends of the opposing inner surfaces of a pair of winding pieces to be wound around the coil sides, and these positioning protrusions and the inner surfaces of the winding pieces are combined with each other. Since the central leg of the core is fitted into the window surrounded by the transformer, the positioning between the core and the core can be done easily and accurately when assembling the transformer. This has the effect of making things easier.

Another advantage is that the insulating paper can ensure a sufficient insulation distance between the coil body and the iron core.

Furthermore, since terminal fittings are attached, processing of lead wires and wiring work can be easily and quickly performed, contributing to improved work efficiency.

Furthermore, the distance between the pair of terminal fittings can be kept constant, and product variations will not occur.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention; Fig. 1 is a perspective view, Fig. 2 is a developed view of the insulating paper for positioning, Fig. 3 is a perspective view of the assembled state, and Fig. 4 is a perspective view of the present invention. FIG. 5, an exploded perspective view of the transformer used, is also an explanatory view of the main parts. 1...Coil body, 1a...Coil side part, 1b
... Lead wire, 2 ... Insulating paper for positioning, 2d,
2e... Winding piece, 2i... Positioning protrusion piece, 2j
...Terminal fitting, 2k...Window part, 13...E type iron core, 13a...Central leg.

Claims (1)

[Claims for Utility Model Registration] A positioning insulating paper made of a single sheet of paper, and a coil body into which the insulating paper is incorporated, the insulating paper being formed symmetrically in the unfolded state,
A pair of winding pieces and a pair of terminal coverings are formed by a nearly T-shaped cutting line formed in the center, cutting lines formed near the left and right upper ends, and a plurality of folding lines formed in the vertical direction. and a connecting piece at the upper center, and positioning protrusions are provided on the upper and lower ends of each end edge of each of the left and right winding pieces, and each of the positioning protrusions arranged in the vertical direction The length between them is set equal to the stacking thickness of the central leg of the core to be incorporated, and furthermore, terminal fittings for connecting the lead wire of the coil body are installed near both ends of the connecting piece, and the coil body Positioning protrusions are arranged inwardly at both ends of the opposing inner surfaces of a pair of winding pieces to be wound around the side portions of the coil, and these positioning protrusions and the inner surfaces of the winding pieces are connected to each other. A coil characterized in that it is constructed by fitting a central leg of an iron core into a window portion that is surrounded by a window.