JPS5940748Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer that improves productivity by reducing the number of component parts and simplifying assembly, and also enables automation of assembly.

As shown in FIG. 1, a conventional flyback transformer has a low voltage coil 3 attached to a coil bobbin 2 in which a terminal pin 1 is embedded. A high-voltage coil 4 is wound, two U-shaped cores 5 are assembled into the coil bobbin 2, the cores 5 are fixed with a fastening fitting 6, and these are housed in an insulating case T. A bottom plate 8 was assembled into the opening, and an insulating filler 10 was injected through an injection port 9 of the bottom plate 8 and hardened.

With this configuration, a fastening fitting 6 made of an elastic metal rod bent into a U-shape is required to fix the core 5, which is disadvantageous in terms of cost. The disadvantages were that it was difficult to measure and the productivity was poor.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 8.

Reference numeral 11 denotes a split-type coil bobbin with a terminal pin 13 implanted in a flange 12 at the lower end and a number of flange 14. This coil bobbin 11 has a low-voltage coil 15 and a high-voltage coil 16 formed by split winding. It is wrapped.

This low voltage coil 15. The leads of the high voltage coil 16 are connected to the terminal pins 13, respectively.

Two U-shaped cores 11 are housed in this coil bobbin 11.

Semicircular grooves 18 are formed on both outer sides of this core 170.

These are housed in an insulating case 19 made of synthetic resin.

This insulating case 19 has a shape in which a cylindrical bobbin storage part into which the coil bobbin 11 is fitted and a rectangular core holding part 21 into which a part of the core 17 is fitted are continuously formed. At the center of the core 17 , a post 23 is provided along one outer surface of the core 17 and has an arc-shaped protrusion 22 that fits into the center hole of the coil bobbin 11 and fits into the groove of the core 17 . A protrusion 24 that fits into the groove 18 of the core is provided at a portion corresponding to the outer surface of the core 17 .

- Also, two protrusions 25 are provided on the ceiling surface of the insulating case 19 to press against the upper surface of the core 17.

The lower end of the support column 23 and the lower end of the core holding part 21 are configured to protrude below the core 11 as shown in FIGS.
7 so as to engage with the lower surface of FIGS. 4 and 5.
As shown in the figure, there are fixed portions 26 and 27.

Further, an engaging step portion 28 is provided on the entire outer circumference of the lower end of the insulating case 19.
is provided.

As shown in FIGS. 6 to 8, a bottom plate 29 through which the terminal pins 13 pass is built into the opening at the lower end of the insulating case 19, and a protruding portion is formed in a portion of the bottom plate 29 corresponding to the bottom surface of the core 17. 30, and an engagement peripheral wall 31 that engages with the engagement step 28 on the lower outer periphery of the insulating case 19 is provided at the peripheral edge.

Further, an injection port 32 is provided in a part of this bottom plate 29,
An insulating filler 33 is injected through the injection port 32 and hardened to fix the coil bobbin and improve insulation.

The core 17 is pressed and held by the protrusion 30 of the bottom plate 29 when the insulating case 19 protrudes, and the insulating filling 3
It is fixed in that state by filling and curing step 3.

Since the flyback transformer of the present invention is constructed as described above, the core is tightened by utilizing the elasticity of the synthetic resin through the pillars and core holding parts integrated with the insulating case, as well as the protrusions and protrusions on the bottom plate. This eliminates the need for fastening fittings.
The number of component parts can be reduced, and assembly can be accomplished by simply assembling the core with the coil bobbin attached to the insulating case and assembling the bottom plate, resulting in excellent productivity and easy automation of assembly. It can also improve productivity in this respect, making it a valuable tool for practical purposes.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional flyback transformer, Fig. 2 is a sectional view showing an embodiment of the flyback transformer of the present invention during assembly, Fig. 3 is a bottom view of the same, and Fig. 4 is another one. 5 is a bottom view of the flyback transformer, FIG. 6 is a sectional view of the completed flyback transformer, FIG. 1 is a bottom view of the flyback transformer, and FIG. 8 is an enlarged sectional view of the main parts. It is. 11... Coil bobbin, 13... Terminal hinge, 15... Low voltage coil, 16...
High voltage coil, 17... Core, 18...
Groove, 19...Insulation case 20...Cylindrical part, 21...Core holding part, 22...
Projection, 23... Support, 24... Projection,
26, 27... Fixed part, 28... Engagement step part, 29... Bottom plate, 30... Protrusion part, 31... Engagement peripheral wall, 32... Inlet, 33... Insulating filling.

Claims (2)

[Scope of utility model registration request] (1) In a flyback transformer, a coil bobbin wound with a low-voltage coil and a high-voltage coil is assembled into a core, this core is assembled into an insulating case together with an insulating filling, and a bottom plate is assembled into the opening of the insulating case. A support that fits into the center hole of the coil bobbin along one outer surface of the core, and a core holding part along the other outer surface of the core,
A flyback transformer in which the lower end of the pillar and core holding part engages with the lower surface of the core. (2) A utility model registration claim in which the ceiling surface of the insulating case is provided with a protrusion that presses against the top surface of the core, the bottom plate is provided with a protrusion that presses against the bottom surface of the core, and the insulating case and the bottom plate are coupled by engagement. Fly bank transformer as described in Scope 1.