JPS6041704Y2 - transformer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a transformer that has a simple structure to prevent the winding from rotating in the circumferential direction.

1 and 2 are a plan view and a partially enlarged perspective view showing a conventional transformer. In the figures, 1 is a core leg, and 2 is a bolt and nut 4 that tightens the core leg 1 through an insulating part 3. Clamps 5 and 6 are a primary winding and a secondary winding that are wound around a cylindrical core tube 7 with sufficient tension applied.
After each winding 5.6 and the core tube 7 are manufactured so that their positions do not move relative to each other, the core tube 7 is inserted into the core leg 1.

As clearly shown in FIG. 2, 8 is a first keyway provided at the end of the core tube 7, and 9 is a second keyway 10 corresponding to the first keyway 8. This fixing plate 9 is fixed to the clamping metal 2 with a bolt nut 12 through a bolt hole 11 at a position where both the keys 18 and 10 face each other, and as a result, Thus, it is firmly fixed to the iron core leg 2.

Reference numeral 13 denotes a key inserted into the opposed first and second keyways 8 and 10, which prevents the core tube 7 from rotating in the circumferential direction relative to the core leg 1.

Conventional transformers are constructed as described above, but such key coupling is generally performed such that the key 13 and the keyway 8.10 fit within a suitable clearance tolerance.
10 must be machined with sufficient dimensional accuracy, and it is often structurally difficult to insert the small key 13 into the key grooves 8 and 10 during assembly, which increases the manufacturing time including the above processing. I was invited.

In order to solve these drawbacks, this invention proposes that a protrusion be provided on the fixed plate so that it can also be used as a key.

FIG. 3 is a partially enlarged perspective view showing an embodiment of this invention, and 14 is a projection that fits into a groove 8 at the end of the core tube 7 provided on the fixed plate 9. As shown in FIG.

The protrusion 14 of this fixing plate 9 corresponds to the fixing plate 9 shown in FIG.
The shape is similar to the state in which the key 13 is attached to the keyway 10 of
That is, the fixing plate 9 and the key 13 are integrated, and the protrusion 14 and the groove 8 provided in the core tube 7 are engaged to prevent the windings 5 and 6 from rotating relative to the core leg 1.

According to this invention, it is not necessary to manufacture the key 13 that was conventionally required, the number of parts can be reduced, and the central axis of the key groove 8 of the conventional winding core tube 7 and the central axis of the key groove 10 of the fixed plate 9. And what had to be done so that three of the central axes of the key 13 were aligned on the same line, the two central axes of the groove 8 of the core tube 7 and the central axis of the protrusion 14 of the fixing plate 9 were aligned. Since the groove 8 and the protrusion 14 only need to be assembled together, it is possible to provide an advantage in manufacturing the winding wire that the combination of the groove 8 and the protrusion 14 is facilitated.

In addition, the dimensions of the groove 8 and the protrusion 14 can be improved in precision because there is no inclusion called a key, and the amount of play in which the winding rotates in the circumferential direction can be reduced, making the rotation prevention effect even more reliable. can.

In the above embodiment, a groove is provided at the end of the core tube 7, but it may be a hole that can fit into the protrusion 14, and the number of grooves is two in the embodiment, but at least one. Needless to say, this is a good thing.

As described above, by adopting this invention, it is possible to prevent damage to the winding insulation and errors in the voltage transformation characteristics of the transformer caused by rotation of the transformer winding in the direction of force reduction. It is possible to provide economical advantages such as improved safety when using the transformer and ease of manufacture of the transformer by integrating the key and the fixing plate.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of a conventional transformer, FIG. 2 is a partially enlarged perspective view of FIG. 1, and FIG. 3 is a partially enlarged perspective view showing an embodiment of this invention. In, 1 is the iron core leg,
2 is a clamp, 5 is a primary winding, 6 is a secondary winding, 7 is a winding core tube, 8 is a groove, 9 is a fixing plate, and 14 is a protrusion. Note that the same reference numerals in each figure indicate corresponding parts.

Claims (1)

[Scope of utility model registration request] The core is tightened by fitting the cylindrical core tube around which the primary and secondary windings are wound with the legs of the core, and placing a clamp on the yoke of the core. The fixed transformer includes at least one groove or hole provided at the end of the cylindrical core tube, and a fixing plate having a protrusion that fits into the groove or hole, and A transformer in which the plate is fixed to the above-mentioned clamp.