JPH025522Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-voltage transformer, and more specifically to the structure of a fitting portion between an outer case and a low-pressure bobbin.

For example, a high-voltage transformer such as a flyback transformer incorporates a low-voltage bobbin and a high-voltage bobbin in an exterior case, winds a low-voltage coil around the low-voltage bobbin, winds a high-voltage coil around the high-voltage bobbin, and connects a terminal to the end of the low-voltage bobbin. The surrounding skirt part (core lead-out part) is fitted to the end peripheral wall of the outer case,
It is constructed by injecting resin into the outer case.

As shown in FIGS. 1 and 2, the fitting structure between the outer case and the skirt in a conventional high voltage transformer is as shown in FIGS.
A vertical groove 4 is formed on the outer surface of both side walls 3, 3, a fitting part 6 of the skirt part 2 is formed in the peripheral wall of the outer case 5, and a groove is formed on both opposing edges of the fitting part 6. A fitting protrusion 7 is provided to the concave groove 4, and a fitting protrusion 7 is provided to the concave groove 4.
was inserted and mated.

By the way, as shown by arrow A in FIG. 2, the side walls 3, 3 of the skirt portion 2 tend to deform inwardly due to shrinkage of the resin after molding, etc., and for this reason, as shown by arrow A in FIG. concave groove 4 and fitting protrusion 7
In the fitting structure, the fitting part is completely free with respect to the deformation direction of the side walls 3, 3, so a gap occurs in the fitting part, and the resin cast inside the outer case leaks to the outside from this gap. become.

In order to prevent such resin leakage, it is necessary to seal the fitting part of the groove 4 and the fitting protrusion 7 with adhesive, but the number of steps for sealing increases accordingly, and the assembly cost increases. The problem is that it is expensive.

Further, if the amount of deformation of the side walls 3, 3 is large, a problem arises in that the side walls 3, 3 get in the way when inserting the ferrite core into the low pressure bobbin.

This idea was made to solve the above-mentioned problem that occurred at the fitting part between the outer case and the skirt part, and the fitting part can prevent deformation due to shrinkage of the side wall of the skirt part. The object of the present invention is to provide a high-voltage transformer in which there is no gap in the fitting portion.

The structure of this invention is that L-shaped fitting protrusions are provided on both sides of the side walls of the skirt portion of the low-pressure bobbin, and fitting recesses of the skirt portion are formed on the peripheral wall of the end portion of the outer case so as to protrude outward. L-shaped grooves into which the fitting protrusions fit are provided at opposing positions on both sides of the projecting wall forming the fitting recess, and the fitting protrusions are held in the L-shaped grooves to maintain the fit. .

An embodiment of this invention will be described below with reference to FIGS. 3 and 4 of the accompanying drawings.

As shown in the figure, the skirt portion 12 connected to the end of the low pressure bobbin 11 has side walls 14 on both sides of the upper wall 13,
14 are formed in a U-shape such that they face each other, and L-shaped fitting protrusions 15 are provided at the ends of both side walls 14, 14.

The fitting protrusion 15 has a protrusion 15a bent outward from opposite ends of the side walls 14, 14.
and a protrusion 15b that is bent along the extension direction of the side wall 14 from the tip of the protrusion 15a, and the protrusion 15b at the tip protrudes outward from the edge of the upper wall 13.

Exterior case 16 that houses the low pressure bobbin 11
A recess 17 into which the skirt portion 12 fits is provided at the end of the peripheral wall, and a U-shaped projecting wall 18 is provided on the outside of the recess 17.

Fitting grooves 19 into which the fitting protrusions 15 are inserted are provided at opposing positions on both sides of the projecting wall 18 .

The fitting groove 19 is connected to the opening 19 into which the protrusion 15a fits, and is bent at a right angle from the inside of the opening 19a.
9b, and the inner surface of the distal end protrusion 15b of the fitting protrusion 15 is joined to the inner wall 20 of the peripheral wall surrounding the vertical groove 19b.

Therefore, even if the side walls 14, 14 of the skirt portion 12 fall inward due to shrinkage after molding, etc., the tip protrusion 1
5b is regulated by the inner wall 20, and this portion prevents the both side walls 14, 14 from falling inward.

A stepped portion 2 on which the edge of the upper wall 13 of the skirt portion 12 comes into contact with the inner surface of the bottom of the U-shaped projecting wall 18
1 is provided, and a skirt portion 12 relative to the projecting wall 18 is provided.
The fitting length is such that the upper wall 1 is attached to the outer peripheral surface of the fitting protrusion 15 on both sides.
3 plus the end edge, making it possible to make the mating length extremely long, thereby increasing the strength of the mating between the two and at the same time preventing leakage when resin is cast into the exterior case 16. can.

In addition, the opposing interval W of the inner wall 20 in the projecting wall 18 is set to a dimension that allows at least the ferrite core to fit therein.

The high-voltage transformer of this invention has the above-mentioned configuration, and when the low-pressure bobbin 11 is assembled into the outer case 16, the skirt portion 12 is fitted into the projecting wall 18 from the recess 17, and the skirt portion 12 is inserted into the projecting wall 18 from the recessed portion 17, Fitting protrusion 1
5 into the fitting groove 19.

In the above-mentioned combination state, the skirt portion 12 of the low-pressure bobbin 11 shrinks after molding, etc., causing the side walls 14, 1
Even if the side walls 14 are tilted inward, the inner wall 20 of the fitting groove 19 restricts the inward movement of the fitting protrusion 15 against the tip protrusion 15b, thereby preventing the side walls 14, 14 from falling inward. It is something.

As described above, according to this invention, L-shaped fitting protrusions are provided on both sides of the skirt part connected to the low-pressure bobbin, and L-shaped fitting protrusions are provided on both sides of the protrusion wall provided on the peripheral wall of the outer case so that the skirt part can be fitted. Since the fitting groove with the cross-sectional shape into which the fitting protrusion fits is provided at the opposing position, the inner wall of the fitting groove restricts the inward movement of the fitting protrusion, and therefore the skirt part There is no possibility that the side walls will collapse inward, and the ferrite core can be installed without any trouble.

Furthermore, since the length of the fitting portion between the skirt portion and the outer case is increased, and the fitting portions are in close contact with each other, it is possible to prevent resin leakage when resin is poured into the outer case.

Furthermore, adhesive seals on the fitting portions are not required to prevent resin leakage, and the transformer assembly process can be simplified.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the fitting part of the case and low-pressure bobbin in a conventional high-voltage transformer, Fig. 2 is a plan view showing the same assembled state, and Fig. 3 shows the main parts of the high-voltage transformer according to this invention. An exploded perspective view showing
FIG. 4 is a plan view showing the assembled state of the same. 11...Low pressure bobbin, 12...Skirt portion, 1
4... Side wall, 15... Fitting protrusion, 16... Exterior case, 18... Projecting wall, 19... Fitting groove, 20...
inner wall.

Claims (1)

[Scope of utility model registration request] An L-shaped fitting protrusion that protrudes outward and then bends in the direction of extension of the side walls is provided at the ends of opposite side walls of the U-shaped skirt part connected to the end of the low-pressure bobbin, and the low-pressure bobbin A fitting recess for the skirt portion is formed in the end circumferential wall of the outer case that houses the case, and a projecting wall provided around the outside of the fitting recess is positioned opposite to each other on both sides.
A high voltage transformer characterized in that a fitting groove is provided in a shape in which fitting protrusions fit into each other.