JPS6214088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a flyback transformer using a two-component adhesive.

In the conventional flyback transformer, the core tightening method is as shown in FIG. A coil component 6 consisting of a low-voltage coil and a high-voltage coil molded in resin was attached to the core 1, and a screw 3 was attached to the outer periphery of the core 1, and a holder 4 was passed through the screw 3 from the upper end and tightened with a nut 5. However, this method has disadvantages in that core misalignment, core chipping, etc. may occur, and the flyback transformer becomes large in size due to the large number of work steps. For this reason, a method of directly bonding the cores without using a fastening tool such as a screw may be considered. In this case, the adhesive used to bond the core can be roughly divided into one-component type and two-component mixed type, and one-component adhesive requires preheating (100℃, about 1 hour) to harden. , which poses a problem in terms of working time. In addition, there are two types of two-component adhesive: a fast-acting type that hardens in about 2 to 3 minutes at room temperature, and a slow-acting type that hardens in about 30 minutes to 1 hour at room temperature. The former fast-acting type is desirable, but because it hardens quickly, it is not possible to mix the base agent and curing agent in a mixer and then inject it into the gap, as is the case with the slow-acting type. Therefore, it was not possible to use fast-acting adhesives.

In view of the above points, the present invention provides a method for manufacturing a flyback transformer using a fast-acting adhesive.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing the first half of the core adhesion process of the present invention, in which A is a top view, B is a side view, and C is a side sectional view. In the figure, a knurl 8 is provided on the outer periphery of the core gear spacer 7, and a cross-shaped flange 9 is integrated with the inner wall. This core gear spacer 7 is placed on the gap surface of one core 1 on the side where the coil is not wound, and the main material 11 is injected into one of the through holes 10 formed by the cross-shaped flange 9. Then, at the same time as the curing agent 12 is injected into the through hole 10 on the diagonal, a donut-shaped spacer (not shown) is placed on the gap surface on the side where the coil is wound, and the base material 11 and the curing agent are placed on top of the donut-shaped spacer (not shown). 12
Apply in a layer. FIG. 3 shows the second half of the core bonding process, in which the other core 1 is fitted into the core gear spacer 7 and the coil bobbin (not shown) on the coil bobbin side. Knurling 1 of the same shape as
3 is brought into contact with the knurling 8 of the core gear spacer 7 and rotated by an external motor (not shown), so that the core gear spacer 7 rotates and moves inside the gear. The base material 11 and the curing agent 12 are mixed. When the core gear spacer 7 rotates two to three times, the base resin 11 and the curing agent 12 are mixed to a sufficient extent to harden the adhesive, so that the rotating disk 14 is released from contact. still,
Between the core gear spacer 7 and the core 1, there is a main material 1.
A gap is provided to allow the core gear spacer 7 to easily mix with the curing agent 12 and to allow the core gear spacer 7 to rotate.
Further, the shape of the flange is not limited to a cross shape, but may be a straight shape, a Y shape, a T shape, or a shape with a circular through hole as shown in FIG.

As described above, according to the present invention, it is possible to significantly shorten the working time, and it is also possible to downsize the flyback transformer.

[Brief explanation of the drawing]

Figure 1 is a diagram of the completed assembly of a conventional flyback transformer, Figure 2 is an embodiment of the present invention, showing the first half of the core adhesion process, Figure A is a top view, Figure B is a side view, Figure C is a 3 is a perspective view of a main part showing the latter half of the core adhesion process, and FIGS. 4A, 4B, 4D are top views of other embodiments of the gear spacer of the present invention. Explanation of main figure numbers, 1...core, 2, 7...core gear spacer, 8, 13...knurling,
9, 15, 16, 17, 18...flange, 1
0, 19, 20, 21, 22, 23...Through hole, 1
1...Main agent, 12...Curing agent, 14...Rotating disk.

Claims (1)

[Scope of Claims] 1. A plurality of through holes are provided in a flange portion integrated with the inner wall of a core gear spacer of a hollow cylindrical body, and the core gear spacer is placed on the gap surface of one core. After separately applying a two-component adhesive to at least two locations of the through hole, the other core is fitted into the core gear spacer, and the core gear spacer is rotated. A method for manufacturing a flyback transformer, characterized in that two cores are bonded by mixing a two-component adhesive. 2. The method for manufacturing a flyback transformer according to claim 1, wherein the two-component adhesive is a fast-acting adhesive. 3. The method of manufacturing a flyback transformer according to claim 1, wherein the core gear spacer has a knurl on its outer periphery.