JPS6311690Y2 - - Google Patents

Description

[Detailed description of the invention] This invention arranges a coil bobbin with a primary winding and a secondary winding wound around a part of the legs of the EI type and EE type iron core, and this coil bobbin is placed inside the case together with the iron core. This relates to a transformer such as a low frequency transformer.

Conventionally, in this type of transformer, Fig. 1~
As shown in FIG.
A primary winding 2 and a secondary winding 3 are respectively wound around a coil bobbin 1 having a primary winding groove 1a and a secondary winding groove 1b in which a secondary winding 3 is wound. It is constructed by housing it in a case 5 while being disposed on the central magnetic leg of an EI type or EE type iron core 4. In addition, in such a power transformer, it is necessary to ensure creepage distances required by standards between the iron core 4 and the primary winding 2 and between the primary winding 2 and the secondary winding 3. Therefore, as shown in FIG. 3, the outer magnetic legs of the iron core 4 and the outer circumferential portion of the coil bobbin 1 are arranged so as to isolate the primary winding 2 and the secondary winding 3 wound around the coil bobbin 1 from other parts. A shielding plate 6 interposed between the case 5 and the inner bottom surface of the case 5 is integrally provided.

However, in such a conventional transformer, the shielding plate 6 is also interposed between the secondary winding 3 and the iron core 4, so the space for winding the secondary winding 3 is reduced. A problem arose.

The present invention solves these conventional problems, and while ensuring sufficient creepage distance between the primary winding and the iron core and between the primary winding and the secondary winding,
The purpose is to improve the space for winding the secondary winding.

In order to achieve this purpose, in this invention,
A step is provided on the outer periphery of the flange that forms the primary winding groove of the coil bobbin, and a shielding plate whose both ends fit into the step is installed inside the case to isolate the primary winding from other parts. It is integrated into the bottom surface. Below, Figures 4 to 7 show an embodiment of the present invention.
This will be explained using the drawings of the figures. In addition, Figures 4 to 7
In the figure, the same parts as in FIGS. 1 to 3 are given the same numbers.

In the figure, reference numeral 7 denotes a shielding plate integrally provided on the inner bottom surface of the case 5, and this shielding plate 7 has a step 1c provided on the outer periphery of the collar that forms the primary winding groove 1a of the coil bobbin 1. The ends fit together, thereby separating the primary winding 2 wound in the primary winding groove 1a from other parts.

That is, in the transformer according to the present invention,
A shielding plate 7 is provided on the case 5 so as to isolate only the primary winding 2 from other parts, and both ends of the shielding plate 7 are fitted into stepped portions 1c provided on the collar of the coil bobbin 1. , as shown in Fig. 7, the creepage distance between the primary winding 2 and the iron core 4 and between the primary winding 2 and the secondary winding 3 is the distance A + B, ensuring a sufficient creepage distance. Moreover, since there is no shielding plate 7 on the side of the secondary winding groove 1b, a sufficient space can be provided for winding the secondary winding 3.

As described above, according to the transformer of the present invention, the secondary winding can be moved while ensuring sufficient creepage distance between the primary winding and the iron core and between the primary winding and the secondary winding. The space for winding can be improved, and the structure is simple and can be obtained at low cost.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional transformer, Figure 2 is a plan view of the coil bobbin of the same transformer, and Figure 3 is a perspective view of a conventional transformer.
The figure is a plan view of the case of the transformer seen from the opening side, FIG. 4 is a perspective view showing a transformer according to an embodiment of the present invention, FIG. 5 is a plan view showing the coil bobbin of the transformer, and FIG. FIG. 7 is a plan view of the transformer case viewed from the opening side, and an enlarged view showing the main structure of the coil bobbin portion of the transformer. 1... Coil bobbin, 1a... Primary side winding groove, 1
b... Secondary winding groove, 1c... Step portion, 2... Primary winding, 3... Secondary winding, 4... Iron core, 5... Case, 7... Shielding plate.

Claims (1)

[Scope of utility model registration request] A coil bobbin which is disposed in a part of the leg of the iron core and has a primary side winding groove in which a primary winding is wound and a secondary side winding groove in which a secondary winding is wound; a case that is housed together with the iron core, and a stepped portion is provided on the outer periphery of the flange that forms the primary winding groove of the coil bobbin, and the stepped portion is provided to isolate the primary winding from other parts. A transformer having a shielding plate integrally provided on the inner bottom surface of the case, both ends of which fit into the transformer.