JPS60210817A - Power supply apparatus - Google Patents

Abstract

PURPOSE:To curtail a number of parts and improve assembling work efficiency by providing the bushing which is engaged with a screw hole of iron core of transformer at the upper end of boss piece provided at the internal bottom of case which encases a transformer. CONSTITUTION:A boss piece 9 is integrally provided at the internal of a case 8 molded by the insulation material. A bushing 10 is integrally provided to the upper end of such boss piece and a screw hole 11 is provided from such bushing part 10 to the boss piece 9. A transformer 14 consisting of the iron core 13 winding a coil 12 is built within such case 8. This iron core 13 is provided with a screw hole 15 bored in the stacking direction. A screw 16 is inserted from the upper part of screw hole 15 and is screwed to the screw hole of boss piece. Thereby, the iron core 13 is tightened and is fixed to the case 8 of transformer 14. A number of parts can be curtailed and assembling work efficiency can be improved by integrally providing the bushing 10 to the boss piece 9 supporting the transformer 14 as described above.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device used to supply power to various electronic devices.

Conventional Structures and Their Problems Recently, with the development of office automation equipment and the like, the demand for power supply devices as power supply sources has increased significantly.

Conventional power supplies of this type are shown in Figures 1 and 2.
A transformer as shown in the figure was used.

That is, a coil 2 in which a primary winding and a secondary winding are wound around a coil bobbin 1 is assembled into an iron core 3 made of an EI type laminated iron core, screw holes 4 are provided in four places in this iron core 3,
An insulating bushing 6 is fitted into one of the screw holes 4, a screw 6 is inserted from the other side of the screw hole 4, and a nut 7 is screwed onto the tip of the screw 6 to tighten the iron core 3.

The insulating bushing 6 is used to prevent a thin current from being generated when the screw 6 comes into contact with the screw hole 4 of the iron core 3, which would deteriorate the performance of the transformer. The position of the screw 6 is regulated by the insulating bushing 6 fitted into it.

The transformer configured in this way is housed in an insulating case together with a rectifier circuit unit, etc., and the insulating case is filled with an insulator to be configured as a power supply device. However, in the above configuration, an insulating bushing 6 is required. There were problems in that it required time and effort to assemble the transformer and was disadvantageous in terms of cost.

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a power supply device that has a small number of components, is easy to assemble, and is inexpensive in terms of cost. .

Structure of the Invention In order to achieve the above object, the power supply device of the present invention is provided with a boss piece having a bushing portion at the upper end on the inner bottom surface of a case made of an insulating material, and a transformer made of an iron core around which a coil is wound is built into the case. , the bushing part of the boss piece is fitted into the screw hole of the transformer iron core, and the screw is inserted into the screw hole to tighten the iron core. By adopting this configuration, the number of parts can be reduced, ease of assembly, This can be advantageous in terms of economy.

Description of examples Hereinafter, one embodiment of the present invention will be described with reference to FIG. 3 of the drawing.

Reference numeral 8 denotes a case with an open top formed of an insulating material such as modified polyphenylene oxide, and four boss pieces 9 are integrally provided on the inner bottom surface of the case 8. A bushing portion 10 having a smaller diameter than the boss piece 9 is integrally provided at the upper end of the boss piece 9, and a screw hole 11 is provided from the bushing portion 10 to the boss piece 9.

A transformer 14 made of an iron core 13 around which a coil 12 is wound is incorporated into the case 8 together with other rectifier circuit units and the like. The iron core 13 of the transformer 14 is of type El,
It is composed of a laminated iron core such as an EE type, and this iron core 13 has four screw holes 16 formed therein that penetrate in the lamination direction.

The bushing part 10 of the boss piece 9 is fitted into the lower end of this screw hole 16, and a screw 16 with a head is fitted from above the screw hole 15, and the screw 16 is self-tapping into the screw hole 11 of the boss piece 9. are screwed together to tighten the iron core 13 and fix the transformer 14 to the case 8.

If necessary, such a case 8 is filled with an insulating material to form a power supply device.

As described above, by providing the bushing portion 10 integrally with the boss piece 9 that floats and supports the transformer 14 of the case 8 made of an insulating material, the number of parts can be reduced, and the screw hole of the boss piece 9 can be reduced. 11 and screw 16 to iron core 13.
Tightening and coupling of the transformer 14 and the case 8 can be performed at the same time.

Effects of the Invention As described above, the power supply device of the present invention requires a separate insulating bushing because the bushing part that fits into the screw hole of the transformer core is provided at the upper end of the boss piece provided on the inner bottom surface of the case that houses the transformer. This eliminates the possibility of the screws coming into contact with the inner wall of the screw holes in the iron core, causing eddy currents that reduce the efficiency of the transformer, and also improves assembly workability by reducing the number of parts, which is significantly advantageous in terms of cost. It has the advantage of being able to be used effectively, and is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a transformer used in a conventional power supply device, FIG. 2 is a front view of the same transformer, and FIG. 3 is a cutaway front view of essential parts showing an embodiment of the power supply device of the present invention. 8...Case, 9...Boss piece, 1o.
... Bushing part, 11 ... Screw hole, 1
2... Coil, 13... Iron core, 14.
Old...trans, 16...group/screw hole, 16...
·Screw. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] A boss piece having a bushing part at the upper end is provided on the inner bottom surface of a case made of an insulating material, a transformer made of an iron core around which a coil is wound is installed in this case, and the bushing part of the boss piece is fitted into the screw hole of the iron core of the transformer. A power supply device that is made by inserting a screw into this screw hole and tightening the iron core.