JPH0140174Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a thin transformer used in general power supplies.

Conventional configuration and its problems Conventional transformers of this type are shown in Figures 1 to 4.
It is configured as shown in the figure. In other words, 1 is a frame core, 2 is a square core, and this square core 2 has 1
A bobbin 5 on which a secondary coil 3 and a secondary coil 4 are wound is assembled, and several notches 7 are formed in both flanges 6 of this bobbin 5, and the primary coil 3 and secondary coil are formed through these notches 7. A leader line 8 from 4 is drawn out.

The lead wire 8 was connected to an external lead wire 10 via a lead terminal plate 9 attached to the upper surface of the secondary coil 4, and after that, an exterior paper 11 was attached, and then the frame-shaped core 1 was assembled. .

In a transformer with this structure, due to the thickness of the lead terminal plate 9 and the external lead wire 10, the transformer dimension a
Moreover, the distance b between the connecting portion 12 between the external lead wire 10 and the lead wire 8 is not constant, which poses a safety problem.

Purpose of the invention In view of the above-mentioned drawbacks, the present invention provides a thin transformer that is smaller than the conventional transformer, has high safety, and has excellent work efficiency during manufacturing.

Structure of the invention In order to achieve the above object, the present invention provides a U-shaped molded lead terminal in which a thin piece is provided between two frame-shaped cores for insulating the external lead wire and the outgoing wire of the coil. A plate is attached, and a molded insulating plate is attached to the outside of the molded lead terminal plate with a thin flange for protecting the external lead wire.

With this configuration, the external lead wire can be wired to the coil by passing between the two frame-shaped cores, so the size can be reduced by the diameter of the external lead wire and the thickness of the lead terminal board, and the insulation is reliable. A thin transformer with excellent safety can be provided.

DESCRIPTION OF EMBODIMENTS A thin transformer according to an embodiment of the present invention will be described above with reference to the drawings.

In FIG. 5, 13 is a frame core, and 14 is a square core. In Fig. 6, 15 is the primary coil 16
The structure is such that an inner bobbin wound with a secondary coil 17 is fitted with an outer bobbin 18 around which a secondary coil 17 is wound. The inner bobbin 15 has a square core 14 in the center.
A rectangular center hole 19 is formed into which the holder is fitted, and flanges 20 and 21 are formed at both ends. The collar 21 on one side is dimensioned to fit into the center hole 22 of the outer bobbin 18, and several notches 23 are formed in a part of the collar 20 on the other side, so that the lead wire 24 of the primary coil 16 can be drawn out. has been done. Also, inner bobbin 1
5 is provided with a U-shaped protrusion 25 so as to surround the notch 23 of the collar 20.
Several grooves 28 are provided for fitting with fitting claws 27 of a molded lead terminal plate 26, which will be described later.

Similarly to the inner bobbin 15, one collar 29 of the outer bobbin 18 has a lead-out groove 31 for drawing out the lead wire 30 of the secondary coil 17, a U-shaped protrusion 32, and a groove for fitting with the molded lead terminal plate 26. 33 are provided. As shown in FIGS. 6 and 7, there is a hole 35 on one side of the center hole 22 of the outer bobbin 18 into which a temperature fuse 34 is inserted, and a guide hole 37 through which the temperature fuse lead wire 36 exits. is provided. Also, Fig. 6, Fig. 8 a, b, and Fig. 9
As shown in the figure, the U-shaped molded lead terminal plate 2
6 has a hole 3 in the center for holding an external lead wire 38.
Several two-step holes 41 are provided on both sides of the hole 39 inside the molded lead terminal plate 26 for passing and fixing the core wire 40 at the tip of the external lead wire 38. Furthermore, L is provided on both sides of the two-stage hole 41.
A thin-walled piece 42 in the shape of a letter is provided, and the outer bobbin 18
and the inner bobbin 15 and molded lead terminal plate 26.
When fitted, the lead wire 24 passes between the thin pieces 42, is connected to the lead core wire 40, and is housed between the thin pieces 42. The outer surface of the thin piece 42 is provided with fitting claws 27 that fit into the grooves 28 and 33 provided in the U-shaped protrusions 25 and 32 of the outer bobbin 18 and the inner bobbin 15, as described above. There are several.

A molded insulating plate 44 is attached to the molded lead terminal plate 26 fitted to the inner bobbin 15 and the outer bobbin 18 so that the connecting portion 43 between the lead core wire 40 and the leader wire 24 does not protrude, and the shape thereof is as shown in FIG. Figure 6, No. 9
As shown in FIG. 10, the molded lead terminal plate 26
The outer lead wire 3 is connected from the corner of the frame-shaped core 13 on both sides.
A thin-walled collar 48 is provided to protect the wire 8, and a hole 45 is provided in the center for passing the external lead wire 38.
A molded lead terminal plate 26 is provided inside the molded insulating plate 44.
Several fitting claws 46 and protrusions 47 for preventing the connecting portion 43 from protruding are provided.

As shown in FIG. 11, the external lead wire 38 is
Because it protrudes outward from between the two frame-shaped cores 13, it is larger than the conventional transformer by the diameter of the external lead wire 38 and the thickness of the conventional lead terminal plate 9 shown in FIGS. 2 and 4. Can be made smaller.
And the core wire 40 of the leader wire 30 and the external lead wire 38
Since the connecting portions 43 are separated by the thin pieces 42, safety is high and work efficiency is improved.

Note that, as shown in FIG. 11, there is a portion d between the two frame-shaped cores 13 where the external lead wire 38 does not protrude.
It can also be used depending on the direction and quantity of the leader line.

Effects of the Invention As described above, the present invention attaches a molded lead terminal plate and a molded insulating plate that fit into an inner bobbin and an outer bobbin between two frame-shaped cores, and connects the molded lead terminal plate and molded insulating plate. By making the external lead wire protrude from between the two frame-shaped cores,
It can be made smaller than before, and in addition, the connection between the external lead wire and the coil outgoing wire is insulated by a thin piece connection protrusion that prevents the connection from floating, and furthermore, the insulation between the core and the internal and external metal parts of the device is insulated. It is of great industrial value, as it has a complete structure, strong retention of external lead wires, excellent ease of assembly, and stable quality.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the core of a conventional thin transformer.
Fig. 2 is a perspective view of the bobbin of the transformer, Fig. 3 is a perspective view of the transformer, Fig. 4 is a sectional view of the transformer, and Fig. 5 is a perspective view of the core of the thin transformer according to an embodiment of the present invention. Fig. 6 is an exploded perspective view of the transformer excluding the core, Fig. 7 is a perspective view of the bobbin of the transformer, and Fig. 8a is a portion of the molded lead terminal plate and molded insulating plate of the transformer. A cutaway perspective view, FIG. 8b is a cross-sectional view of the molded lead terminal plate and molded insulating plate of the transformer, FIG. 9 is a cross-sectional view of the transformer, and FIG. 10 is an exploded view of the transformer excluding the core. A perspective view, FIG. 11 is a sectional view of the transformer,
FIG. 12 is a perspective view of the transformer. 13... Frame-shaped core, 14... Square core, 15...
...Inner bobbin, 16...Primary coil, 17...2
Next coil, 18... Outer bobbin, 26... Molded lead terminal plate, 30... Outgoing wire, 38... External lead wire, 42... Thin piece, 44... Molded insulating plate, 4
8...Thin tsuba.

Claims (1)

[Scope of utility model registration request] A rectangular core made of laminated rectangular pieces of electromagnetic steel sheets is arranged between two frame-shaped cores formed by laminating electromagnetic steel plates in an annular shape, so that the rectangular core is formed with the frame-shaped core, and A bobbin wound with a coil is attached to a rectangular core, and an external lead wire is held in a U-shape between the two frame-shaped cores, and the connecting portions of the core wire of this external lead wire and the lead wire of the coil are connected respectively. A U-shaped molded lead terminal plate provided with an insulating thin piece is attached so as to fit into the bobbin, and a thin flange for protecting the external lead wire and a floating part for the connection part are provided on the outside of the molded lead terminal plate. A thin transformer in which a molded insulating plate provided with a prevention protrusion is attached, and the external lead wire is wired between the two frame-shaped cores.