JPH027449Y2 - - Google Patents

Description

[Detailed description of the invention] The invention simplifies the installation of a terminal board that holds the external lead wire connected to the coil lead wire, and an insulating plate that insulates the connection between the lead wire and the external lead wire. This invention relates to a transformer that can reliably insulate adjacent connection parts.

The first transformer of this type in the past.
It was constructed as shown in Fig. 2. That is, the terminal board 1 is formed in a U-shape, and has a protrusion 5 on the upper surface of which constitutes a storage groove 4 in which a connecting portion 3 between an external lead wire 2 and a coil leader wire 12 is stored.
A tongue piece 7 having a through hole 6 into which the external lead wire 2 is fitted is provided on the side surface corresponding to the storage groove 4, and the external lead wire 2 is fitted into the through hole 6 of the tongue piece 7 from above. The external lead wire 2 is attached so that the core wire 8 of the external lead wire 2 is drawn out from the lower surface of the terminal board 1 through the small hole into the storage groove 4, and the lead wire 12 of the coil is inserted into the storage groove 4 as shown in FIG. After connecting to the core wire 8 in the groove 4, the terminal board 1
The structure was such that the engagement holes 11 at both ends of the insulating plate 10 were fitted into the inverted L-shaped engagement pieces 9 provided at the center of both ends of the upper surface. This terminal board 1 was placed on a part of the circumferential surface of a coil bobbin 15 around which a coil 14 was wound.

In this structure, an inverted L-shaped engagement piece 9 and an insulating plate 10 are provided at the center of both ends of the upper surface of the terminal board 1.
The fitting with the engagement hole 11 at both ends of the is weak, and therefore the connection part 3 between the external lead wire 2 and the coil extraction wire 12 protrudes from the storage groove 4, and the insulation distance between the external conductor and the adjacent connection part is reduced. The structure also became unstable and lacked reliability.

The present invention eliminates the above-mentioned conventional drawbacks, and embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

16 is an iron core, and this iron core 16 has a coil 1.
A coil bobbin 18 wound with a coil bobbin 7 is incorporated. Several notches 20 are formed in the flange 19 of this coil bobbin 18, and a lead wire 21 of the coil 17 is drawn out from these notches 20. Moreover, on the outer surface of this flange 19, a terminal board 23 (described later) is formed.
A recessed notch 22 into which both ends are fitted is provided.
The terminal board 23 is formed of an insulating material into a U-shape, and a plurality of protrusions 25 are formed on the upper surface and both outer surfaces for dividing the storage groove 24 into several pieces, each of which has a U-shape. A lead wire holding tongue piece 28 having a through hole 27 into which an external lead wire 26 is inserted is provided at the lower end of both sides corresponding to the lead wire 24 so as to protrude laterally, and also forms the storage groove 24. A recess 31 is formed in the protrusion 25 for fitting with the inner protrusion 30 of the molded insulating plate 29. Four stepped engagement holes 32 are provided at the four corners of the terminal board 23 into which molded insulating plates 29, which will be described later, are fitted.

One end of the external lead wire 26 is inserted into the terminal board 23 from above the lead wire holding tongue piece 28 using the through hole 27, and the core wire 33 is folded back on the lower surface of the lead wire holding tongue piece 28. The coil 17 is inserted upward through the hole and positioned in the drawer storage groove 24.
It is connected to the leader line 21 of.

Both sides of the terminal board 23 are fitted into the recessed part 22 of the collar 19 of the coil bobbin 18 to be coupled.

Furthermore, a molded insulating plate 29 is incorporated into the upper surface of this terminal board 23. At both ends of this molded insulating plate 29, arrow-shaped protrusions 34 are formed, which are positioned with the engagement holes 32 at the four corners of the terminal board 23, and are fitted and fixed, as shown in FIG. As shown, an inner surface protrusion 30 is formed on the surface that overlaps with the terminal board 23 to fit into a recess 31 in the protrusion to form the storage groove 24 of the terminal board 23 and to ensure an insulating distance from the adjacent connection part. has been done. This molded insulating plate 29 has an arrow-shaped protrusion 3 as shown in FIG. 6A.
4 is aligned with the engagement hole 32 of the terminal board 23 and pressed in the direction of the arrow, so that the side pieces 35 of the arrow-shaped protrusion 34 are tapered and bent inward as shown in FIG. 6B. The bonding is completed as shown in FIG. 6C.

In addition, as shown in FIG.
It is also possible to configure the terminal board 23 and the molded insulating plate 29 in the opposite manner.

This completes the transformer, but the transformer can also be housed in a metal case and insulated to provide insulation.

As described above, the transformer of the present invention has an engaging hole for positioning and fixing, or an arrow-shaped It has a structure in which a protrusion is provided and an insulating plate provided with an arrow-shaped protrusion or engagement hole that fits into the engagement hole or arrow-shaped protrusion is coupled, so it is easy to incorporate the insulating plate into the terminal board. Also, on the surface where the insulating plate and the terminal board overlap, the insulating plate has an inner protrusion,
By providing recesses on the terminal board and fitting them into each other, the insulation distance from the external conductor or adjacent external lead wire connection part is always constant, improving reliability. It has great practical value, as it strengthens the flexural strength of the insulating plate, and also makes the insulating plate more secure, making it highly safe and of high quality.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the main parts of a conventional transformer.
Fig. 2 is a perspective view of the main parts, Fig. 3 is a sectional view showing an embodiment of the transformer of the present invention, Fig. 4 is an exploded perspective view of the main parts, and Fig. 5 is a sectional view of the main parts. , Figure 6A
-C are sectional views of essential parts of the terminal board and insulating plate in an assembled state, and FIG. 7 is an exploded perspective view of the terminal board and insulating plate of another embodiment. 16... Iron core, 17... Coil, 18... Coil bobbin, 19... Tsuba, 20... Notch, 21...
...Leader wire, 22...Concave cutout, 23...Terminal board,
24... Storage groove, 25... Projection, 26... External lead wire, 27... Through hole, 28... Lead wire holding tongue piece, 29... Insulating plate, 30... Inner protrusion, 31
... recess, 32 ... engagement hole, 33 ... core wire, 34
...Arrow-shaped ridge, 35...Both sides pieces.

Claims (1)

[Scope of utility model registration request] A coil is wound around a coil bobbin that is assembled into an iron core and has flanges at both ends.A U-shaped terminal board is placed on the circumferential surface of this coil bobbin, and a through hole is provided in the side surface of this terminal board through which an external lead wire can be inserted from above. The core wire of this external lead wire is drawn out from the bottom surface of the terminal board to the top surface, and the connecting portion between this core wire and the lead wire of the coil is provided in a storage groove defined by a protrusion formed on the top surface of the terminal board. A recess is provided in the protrusion of the terminal board, and an inner protrusion that fits into the recess provided in the protrusion of the terminal board is provided on the bottom surface of the insulating plate that is placed over the top surface of the terminal board, so that the protrusion of the terminal board is insulated. An arrow-shaped protrusion for positioning and fixing is provided on one of the ends of the plate, an engagement hole is provided at a position corresponding to the other arrow-shaped protrusion, and the arrow-shaped protrusion and the engagement hole are fitted. A transformer is made by combining an insulating plate with a terminal board.